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Note that files with single-character names cannot contain alternate streams because these file names are treated by Windows as drive letters. When a drive letter is specified with a relative path, a colon separates the drive letter from the path. When there is an ambiguity about whether a single-character name is a drive letter or a file name, Windows will assume a drive letter if the string following the colon is a valid path, and a file name otherwise. This will occur regardless of whether the drive letter or file name is valid.

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