Nochmal zum Nachlesen:
Naming Files, Paths, and Namespaces
Zitat:
The Windows
API has many functions that also have
Unicode versions to permit an extended-length path for a maximum total path length of 32,767 characters. This type of path is composed of components separated by backslashes, each up to the value returned in the lpMaximumComponentLength parameter of the GetVolumeInformation function (this value is commonly 255 characters). To specify an extended-length path, use the "\\?\" prefix. For example, "\\?\D:\very long path".
Da in den Delphi-
Unicode-Versionen in der Regel immer die
Unicode-Variante der Windows-
API verwendet wird, sollte das eigentlich immer funktionieren.