Extract drive and directory parts of filename.
function ExtractFilePath(const FileName: AnsiString): AnsiString; overload;
AnsiString ExtractFilePath(const AnsiString FileName);
ExtractFilePath extracts the drive and directory parts of the given filename. The resulting AnsiString is the leftmost characters of FileName, up to and including the colon or backslash that separates the path information from the name and extension. The resulting AnsiString is empty if FileName contains no drive and directory parts.
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