We haven't done this because that would require more work on checking the UNC path. For instance, `\\...`, `\\UNC\...`. Ideally, after prepending, it would look like: `\\?\\\UNC\...` See more information in https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#maximum-path-length-limitation "The "\\?\" prefix can also be used with paths constructed according to the universal naming convention (UNC). To specify such a path using UNC, use the "\\?\UNC\" prefix. For example, "\\?\UNC\server\share", where "server" is the name of the computer and "share" is the name of the shared folder."
Bug 1626523 Comment 0 Edit History
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We haven't done this because that would require more work on checking the UNC path. For instance, `\\...`, `\\UNC\...`. Ideally, after prepending, it would look like: `\\?\\\UNC\...` See more information in https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#maximum-path-length-limitation "The "\\\\?\\" prefix can also be used with paths constructed according to the universal naming convention (UNC). To specify such a path using UNC, use the "\\\\?\\UNC\\" prefix. For example, "\\\\?\\UNC\server\share", where "server" is the name of the computer and "share" is the name of the shared folder."