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Extended-length paths are file and directory names that have a combined length greater than 259 characters with a maximum length of approximately 32,766 characters. When passing an extended path to a supporting function, the path must be an absolute path. It cannot be a partial nor relative path and path segments must be separated by back slashes (\). Forward slashes (/) cannot be used. Either the "\\?\" prefix for local path or the "\\?\UNC\" for UNC paths can be added to the beginning of a path to improve performance. The "\\?\" prefix should be placed before the drive letter of a local path. The "\\?\UNC\" prefix should replace the leading "\\" for UNC (share) paths. Supporting functions that return absolute paths automatically include the appropriate extended-length path prefix when the total length exceeds 259 characters. Note that optical media, like the ISO 9660 CD/DVD format, often have more restrictions on the length of files, folders, and paths than the Windows operating system so these devices may not support extended-length paths. The following file and directory functions support extended-length paths:
The following functions support extended-length paths but require the extended-length file paths to be converted to a Unicode string before being passed to the function: Note: Extended-length file paths may be converted to a Unicode string using ChrStringToUnicode.
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Step by step guide to learning WIL
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