_SplitPath

C:\abc\123.txt => Drive = C:, Path = \abc\, FileName = 123, Extension = .txt
C:\abc\123.12.txt => Drive = C:, Path = \abc\, FileName = 123.12, Extension = .txt
C:\abc\123.txt.12 => Drive = C:, Path = \abc\, FileName = 123.txt, Extension = .12
\\192.168.1.1\abc\123.txt => Drive = "", Path = \\192.168.1.1\abc\, FileName = 123, Extension = .txt