Fix 'Transfer Tool Cannot Be Found' in WinCC Flexible 2008 SP2

Field engineers maintaining Siemens SIMATIC HMI panels routinely encounter the "Transfer tool can not be found" error when attempting to download a backed-up .hmi project from WinCC Flexible 2008 SP2 to an MP 277 or TP 277 6" panel over Ethernet. The error halts commissioning, blocks recipe or screen updates, and—if the HMI is a critical operator interface—can stop the line. This reference documents the root cause, the exact diagnostics, and the field-proven remediation steps to restore project transfer on a Windows XP SP3 engineering station.

The error presents in two forms: as an IDE dialog ("Transfer tool can not be found") and as a Pack & Go console error (transfertool.exe is not a valid Win32 application). Both originate from the same underlying condition: a missing or corrupted transfer component in the WinCC Flexible installation or in the project archive. Resolving the issue requires repairing the engineering station, not the HMI panel itself, which is almost always functioning correctly when it responds to ping and accepts the transfer-mode prompt.

1. Problem Description and Observable Symptoms

When the engineer opens the .hmi backup in WinCC Flexible 2008 SP2, configures the transfer settings with the correct panel IP address, places the HMI in Transfer mode, and initiates the download, the following symptoms appear:

• Primary symptom: Dialog reading "Transfer tool can not be found" appears immediately when Project → Transfer → Transfer (or the toolbar Transfer button) is selected. No compile is attempted; the transfer halts before the Ethernet session opens.
• Secondary symptom (Pack & Go): The *.bat file extracted from the Pack & Go archive aborts with the console error:

  '\\project\<projectname>\transfer\transfertool.exe' is not a valid Win32 application.

  The transfer tool binary inside the archive is rejected by Windows as malformed or built for an incompatible platform.
• Tertiary symptom: On one or more engineering stations, the Transfer command in the WinCC Flexible menu is grayed out, missing, or not present at all, even with a valid project open.
• Network verification passes: The HMI responds to ping <HMI_IP> from the programming device (PG), confirming IP reachability and the absence of L2/L3 routing problems.
• HMI is in Transfer mode: The panel's Control Panel → Transfer setting is enabled, or the auto-transfer prompt has been accepted.

2. Affected Products, Part Numbers, and Software Versions

The error has been observed on the following Siemens product combinations. Catalog numbers are listed for spare-part identification in CMMS systems.

WinCC Flexible 2008 SP2 was released as a maintenance update for the WinCC Flexible 2008 product line. It supports Windows XP SP2/SP3, Windows Vista (32-bit), and Windows 7 (32-bit) with limitations. Both the IDE and the embedded transfer components are 32-bit Win32 applications. The "not a valid Win32 application" error specifically indicates the loader could not parse the PE header—typically because the binary is zero-byte, truncated, or built for a 64-bit-only or non-x86 target.

3. Root Cause Analysis

Four independent failure modes converge on the same user-visible error. Each must be eliminated in turn before commissioning can resume.

3.1 Missing or Corrupted HmiTransfer Component

WinCC Flexible 2008 SP2 stores its Ethernet transfer utility in a fixed path beneath the installation root. The default install path on Windows XP SP3 is:

C:\Program Files\Siemens\Automation\WinCC Flexible\HmiTransfer.exe
C:\Program Files\Siemens\Automation\WinCC Flexible\HmiTransferRes.dll
C:\Program Files\Siemens\Automation\WinCC Flexible\Transfer\

If the install was interrupted (power loss, disk full, antivirus quarantine, or improper removal of a previous version), the component is missing or partially written. WinCC Flexible then raises "Transfer tool can not be found" at runtime. The IDE itself remains functional for editing and compile; only the transfer path is broken.

3.2 Pack & Go Archive Created on a Defective Install

The Pack & Go function (Project → Pack & Go) creates a self-contained ZIP archive that includes the project file and a copy of the local transfer tool. If the local transfer tool was already broken when Pack & Go was generated, the archive inherits the corruption. When a second engineer unpacks the archive on a different PG and runs the included *.bat, Windows rejects the embedded transfertool.exe with the "is not a valid Win32 application" message. Distributing the bad archive replicates the failure to every PG that opens it.

3.3 Windows Firewall or Security Suite Blocking the Transfer

WinCC Flexible 2008 SP2's Ethernet transfer opens dynamic TCP/UDP ports (typically ephemeral 1024–65535) and uses port 50000 for the transfer session. The default Windows XP SP3 firewall, or any third-party endpoint protection (McAfee, Norton, Trend Micro, Sophos), can silently drop these packets. In that case the IDE may report a generic "Transfer tool" error rather than a network-specific timeout. This is more common on engineering stations that have been "hardened" against modern threats.

3.4 Project-Device Type Mismatch (Latent Cause)

If the .hmi backup was created for an MP 277 and the target panel is a TP 277 6", the project must be recompiled for the new device. WinCC Flexible will block the transfer with a device-incompatibility error after the transfer tool loads. Engineers routinely conflate this with a transfer tool failure when only the tool-loading succeeds and the device check fails. Always confirm the source and target panel type before troubleshooting the tool. MP 277 (8" or 10" color TFT) and TP 277 (6" or 10") differ in screen real estate, color depth, and supported control set.

4. Pre-Diagnostic Verification

Before touching the WinCC Flexible installation, run the following checks to isolate the failure domain.

1. Verify HMI reachability. From the PG, open a command prompt and execute ping <HMI_IP> -n 4. A successful reply (typically <10 ms on a direct connection) confirms L3 connectivity. The failure in the source case passed this check, which immediately rules out cabling, switch, and IP configuration errors.
2. Confirm the HMI is in Transfer mode. On the panel, navigate to Control Panel → Transfer (or Start → Settings → Control Panel → Transfer on Windows CE panels). Verify Enable Transfer is checked. On a panel with no project loaded, also enable Wait for transfer after startup; otherwise the panel may boot into a fault state and refuse the session.
3. Confirm the project device type. In WinCC Flexible, open the .hmi file. Select Project → Device → Select Device (or view the device name in the project tree root). Confirm the device matches the physical HMI. An MP 277 project will not transfer to a TP 277 6" without explicit device conversion (Project → Device → Convert).
4. Inspect the WinCC Flexible installation. Open Windows Explorer and navigate to C:\Program Files\Siemens\Automation\WinCC Flexible\. Verify the presence of HmiTransfer.exe and the Transfer subdirectory. A missing or 0-byte HmiTransfer.exe confirms root cause 3.1. Right-click → Properties → Details to compare the file version against a known-good PG.
5. Test with a known-good sample project. Create a new empty project in WinCC Flexible 2008 SP2 for the target device type and attempt transfer. If the sample project also fails with the same error, the engineering station is definitively at fault. If the sample transfers, the source .hmi archive is corrupt and must be obtained from a fresh backup or from a peer who can export it.
6. Check Windows Event Viewer. Open Control Panel → Administrative Tools → Event Viewer → Application. Look for HmiTransfer.exe, WinCC Flexible, or SideBySide errors at the time of the failed transfer. These often pinpoint a missing CRT DLL (e.g., msvcr90.dll, msvcp90.dll) required by the transfer tool under the Visual C++ 2008 SP1 redistributable.
7. Compare install dates between PGs. Both PGs in the reported case ran Windows XP SP3 and WinCC Flexible 2008 SP2. If both were imaged from the same source, the corruption was likely distributed at image time. Re-image one PG as a control and confirm the failure is image-wide.

5. Resolution 1: Repair the WinCC Flexible 2008 SP2 Installation

This is the primary fix and resolves the majority of field cases. The repair mode restores any missing or corrupted transfer components without disturbing the project files or the Automation License Manager (ALM) activation.

1. Close all WinCC Flexible instances on the engineering station. Use Task Manager to confirm no HmiTransfer.exe or WinCCFlexible.exe processes are running.
2. Insert the WinCC Flexible 2008 SP2 installation media, or mount the original ISO. If the original media is unavailable, the install source can be copied from a clean engineering station that has a working installation, or re-acquired from the Siemens Industry Online Support portal.
3. Launch setup.exe from the installation root with administrator rights. On Windows XP SP3, right-click and select Run as..., then choose an account in the local Administrators group.
4. Select Install / Reinstall. The setup detects the existing installation and offers three options: Modify, Repair, and Remove. Choose Repair.
5. In the component tree, ensure WinCC Flexible Transfer (sometimes labeled HmiTransfer, Transfer Tool, or Transfer Component) is marked for installation. Add any missing optional components related to Ethernet and PROFINET transfer.
6. Complete the wizard. When prompted, restart the engineering station. A reboot is required because the HmiTransfer.exe service hooks and DCOM registrations are replaced during repair.
7. After reboot, open WinCC Flexible 2008 SP2, load the project, and retry the transfer. The "Transfer tool can not be found" dialog should not reappear.

If Repair mode is unavailable (e.g., setup media is missing or the install was deployed via SMS/SCCM with a transform), use the msiexec /fa command to force a reinstall of the WinCC Flexible MSI package. The relevant MSI GUID can be found under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall in the registry.

6. Resolution 2: Windows XP SP3 Firewall and Network Configuration

If the repair install resolves the "Transfer tool" dialog but the transfer still times out, the firewall is the next suspect. Windows XP SP3 ships with Windows Firewall enabled by default and blocks all unsolicited inbound traffic.

1. Open Control Panel → Windows Firewall.
2. Select the Exceptions tab.
3. Click Add Program... and browse to C:\Program Files\Siemens\Automation\WinCC Flexible\HmiTransfer.exe. Add it to the exception list and set its scope to the local subnet (do not use Any computer on a plant network).
4. Add C:\Program Files\Siemens\Automation\WinCC Flexible\WinCCFlexible.exe (the IDE) to the same exception list.
5. Add explicit port exceptions for UDP 50000 and TCP 50000 (the default WinCC Flexible transfer ports) as inbound and outbound rules. Direct port rules are more reliable than per-program rules when the transfer tool dynamically re-executes helper binaries.
6. Disable any third-party endpoint protection temporarily to test. McAfee, Norton, Trend Micro, Kaspersky, and Sophos products have been observed to drop WinCC Flexible packets even when the program is on the exception list. Add the entire C:\Program Files\Siemens\Automation directory to the trusted application list in those products.
7. Verify by initiating a transfer. The HMI should display the transfer progress bar within 2–5 seconds of the IDE command.

7. Resolution 3: Repairing a Corrupted Pack & Go Archive

If the Pack & Go archive is the carrier of the defect (i.e., it was created on a PG that already had the broken transfer tool), the archive must be regenerated. Do not attempt to patch the embedded transfertool.exe; it is a signed component and tampering will trigger antivirus alerts and will leave the archive in a non-functional state.

1. Identify a PG with a known-good WinCC Flexible 2008 SP2 installation—i.e., a PG that can transfer projects successfully. If none exists locally, perform Resolution 1 on a dedicated engineering station first.
2. Copy the source .hmi project file to that PG. Do not use the original suspect archive as the carrier.
3. Open the project in WinCC Flexible 2008 SP2 and perform Project → Compile → Software (Rebuild All). This step embeds the current device firmware image and screen database into a transfer-ready form and re-emits any dependent components.
4. Select Project → Pack & Go. Specify an output directory on a clean USB drive or network share. The resulting ZIP will contain a fresh, valid 32-bit transfertool.exe signed for Win32 execution.
5. On the original target PG, copy the new archive, unzip to a writeable directory (avoid C:\Program Files if UAC is involved), and execute the *.bat file. The console should launch the transfer tool without the "not a valid Win32 application" error.

Alternative: skip Pack & Go entirely and use the ProSave utility for direct transfer. ProSave ships with WinCC Flexible 2008 SP2 and is independent of the IDE transfer path. See Resolution 4.

8. Resolution 4: Manual Project Transfer via ProSave

ProSave is the canonical Siemens backup/restore utility for SIMATIC HMI panels. It is installed alongside WinCC Flexible 2008 SP2 and can be used when the IDE transfer is broken. ProSave is also the only path available when only a runtime .psb or .hmi backup exists and the source PG is unavailable.

1. On a PG with a working WinCC Flexible 2008 SP2 installation, open Start → Programs → Siemens Automation → WinCC Flexible 2008 SP2 → ProSave. The default install path is C:\Program Files\Siemens\Automation\WinCC Flexible\ProSave\ProSave.exe.
2. In the General tab, set Device type to the target panel (e.g., TP 277 6" or MP 277 8" Touch).
3. Set Connection to Ethernet and enter the panel's IP address. Click Test to verify reachability and version compatibility.
4. Switch to the Restore tab. Select the .hmi file to restore, then click Restore. ProSave will handle the transfer without invoking the IDE's HmiTransfer.exe.
5. Watch the HMI screen for the transfer progress bar. A full project restore for a TP 277 6" typically completes in 60–180 seconds over 100 Mbit Ethernet. An MP 277 10" project with many screens and scripts may take 5–10 minutes.
6. If the restore fails, examine the ProSave log under View → Log for hex error codes. Common codes include 0x80072EE2 (timeout) and 0x80070005 (access denied) which point to firewall and license issues respectively.

9. Resolution 5: Restoring the Missing Transfer Menu Option

When the Transfer command is absent from the WinCC Flexible 2008 SP2 menu—even on a freshly installed system—the cause is usually a project-state or focus issue, not an install defect.

1. Confirm a project is open. The Transfer menu is disabled when no project is loaded or when the project window does not have focus.
2. Click in the project tree to give the project window focus, then re-check the Project → Transfer submenu. The option should reappear in the menu bar.
3. If the menu is still missing, check Options → Settings → Workbench. In some customizations the Transfer toolbar button has been removed by an administrator. Re-enable it via View → Toolbars → Transfer.
4. Verify the user account has write access to the project directory. WinCC Flexible disables transfer if it cannot write the compiled *.fwx firmware file to the project folder. On a read-only network share, the transfer silently fails with no menu entry.
5. Re-register the WinCC Flexible transfer components by running the following from a command prompt with administrator rights:

   cd "C:\Program Files\Siemens\Automation\WinCC Flexible"
   regsvr32.exe HmiTransferRes.dll
   regsvr32.exe HmiOcxTransfer.dll

   Restart the IDE after re-registration. A reboot is not required but recommended.
6. If the menu remains absent, delete the user-specific WinCC Flexible settings at %APPDATA%\Siemens\WinCC Flexible 2008\ to reset the workbench layout. The IDE will rebuild the default layout on next launch.

10. Verification and Commissioning Validation

After applying any of the resolutions above, perform the following validation sequence before declaring the HMI back in service.

1. Sample project transfer test. Create a one-screen empty project in WinCC Flexible 2008 SP2 targeting the same device type as the field panel, and transfer via Ethernet. Confirm the transfer completes in under 60 seconds and the new screen appears on the HMI.
2. Original .hmi project transfer test. Load the field .hmi file, compile (Rebuild All), and transfer. Verify all screens, scripts, tags, and alarms populate. Cross-check the HMI's tag list against the project tag list to confirm no objects were silently dropped.
3. Recipe and log round-trip. Modify a recipe on the HMI, then back up the HMI with ProSave. Restore to a local .psb archive. Confirm the recipe persists in the archive and can be re-loaded.
4. Fault simulation. Disconnect the Ethernet cable mid-transfer to confirm the IDE reports a clean network error (not the "Transfer tool" error). This validates the transfer tool is loaded and active, and that subsequent network errors are reported with the correct code.
5. Log the successful transfer in the commissioning report. Record the WinCC Flexible 2008 SP2 build number, the HMI firmware version (visible on Control Panel → System → Version on the panel), and the engineering station hostname. This information is invaluable for support tickets and for future migration planning.

11. Edge Cases, Related Errors, and Migration Notes

Several errors present similarly to the "Transfer tool cannot be found" message but have different root causes. Recognize them to avoid wasted troubleshooting time.

Device type conversion caveat: When converting a project from MP 277 to TP 277 6", screen objects positioned for the larger MP 277 display will be clipped or off-screen on the 5.7" TP 277. Resize screens manually or use the auto-resize feature in Tools → Resize Screens. Some MP 277-specific controls (e.g., Browser, Sm@rtClient viewer, Trend view with history) are not available on TP 277 and must be removed before transfer, or replaced with TP 277-compatible equivalents. Compile the project after conversion and review the warning list for unsupported objects.

Windows 7 and later hosts: If the engineering station is upgraded to Windows 7 or Windows 10 (32-bit), WinCC Flexible 2008 SP2 must be run with administrator rights and in Windows XP SP3 compatibility mode. The 64-bit versions of Windows are not supported by WinCC Flexible 2008 SP2; the transfer tool will refuse to load with a SideBySide error. For new deployments, Siemens recommends migrating to TIA Portal WinCC, which supports 64-bit Windows and modern security models.

Windows XP SP3 end-of-life note: Microsoft ended support for Windows XP in April 2014. Engineering stations still running XP SP3 with WinCC Flexible 2008 SP2 should be isolated on a dedicated management VLAN and protected by a plant firewall. New vulnerabilities in the SMB/CIFS stack used by legacy transfer paths will not be patched. Plan a migration to a supported OS and TIA Portal WinCC within the next maintenance window.

HMI firmware version compatibility: MP 277 and TP 277 panels ship with multiple firmware revisions. A project compiled against WinCC Flexible 2008 SP2 can typically be loaded onto panels with firmware version 9.0.0 and later, but older panels (firmware 7.x) may reject the project with an "Incompatible image" error. Check the panel firmware under Control Panel → System → Version and update via ProSave OS Update if necessary. The OS update package is shipped as a .imx file under the WinCC Flexible install media.

Anti-virus false positives: The transfer components in WinCC Flexible 2008 SP2 were signed in the 2008–2009 era and may trigger modern heuristic alerts in Windows Defender or other AV products, which then quarantine the binary. Add the entire C:\Program Files\Siemens\Automation tree to the AV exclusion list before commissioning to prevent re-quarantine. Document the exclusion in the plant security policy.

Frequently Asked Questions