Windows error 206 (ERROR_FILENAME_EXCED

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A file name or extension exceeds the limit accepted by the active path-processing context.

Could be also:
Constant	Type	OS
HTTP_STATUS_PARTIAL_CONTENT	HTTP Code	Any
DRIVER_UNLOADED_WITHOUT_CANCELLING_PENDING_OPERATIONS	BugCheck Code	Windows

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ERROR_NO_SIGNAL_SENT	ERROR_RING2_STACK_IN_USE

ERROR_FILENAME_EXCED_RANGE

The file name is too long

ERROR_FILENAME_EXCED_RANGE is returned when a path component or complete path exceeds a supported length. Limits depend on the API, path prefix, application manifest, and target file system.

What to check

Measure both the total path and individual component lengths.
Check whether the application and API support extended-length paths.
Avoid repeatedly nesting generated directory names.
Preserve the original extension when shortening generated names.

How to handle it

Shorten or redesign the path deterministically. Hashing a variable portion can help, but maintain a mapping so diagnostics and cleanup remain possible.

References

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