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ERROR_MRM_FILEPATH_TOO_LONG
ERROR_MRM_FILEPATH_TOO_LONG means a path used while indexing or loading a resource exceeds the supported length for that resource-management operation.
What to check for ERROR_MRM_FILEPATH_TOO_LONG
- Shorten the project-root path, generated-output path, or deeply nested resource folder names.
- Check both the source path and the package-relative path generated by the build.
- Rebuild the PRI after correcting paths; do not truncate names in the packaged output manually.
Microsoft: Resource Management System and PRI files
Microsoft: MakePri.exe command-line options
Microsoft: MakePri.exe configuration file
Where the result is returned
This result is Win32 system error 15121 (0x00003B11) from winerror.h. AllStat describes it as “Filepath too long.”. The code is useful only together with the API that failed, because multiple Windows components can reuse system-error values while imposing different retry and cleanup rules.
Diagnostic sequence
- Call GetLastError immediately after the failing API and save this result, the function name, all relevant flags, and the target path, handle, service, device, account, or policy object.
- Capture the component log that owns the mrm / filepath / too / long operation and retain the original numeric value before a framework converts it to an HRESULT or exception.
- compare preconditions with the API documentation and reproduce with a minimal request before changing system-wide configuration.
Retry this result only after the resource or state named in “Filepath too long.” has changed. For invalid parameters, unsupported formats, missing objects, policy restrictions, and access failures, correct the input or configuration instead of immediately repeating the same call.
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