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openedon Apr 2, 2016
libstd should automatically insert \\?\ when necessary. The path must be canonicalized first; this can be done using the Windows API function GetFullPathNameW.
A necessary condition for needing to call GetFullPathNameW is that the path does not begin with \\?\. Afterwards, if the path begins with \\ but not \\?\, the \\ must be replaced with \\?\UNC\.
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