Would this help:

DECLARE

@fileTimeStampVARCHAR(500),

@cmdTextVARCHAR(500),

@rootSourceFileVARCHAR(500),

@fullSourceFileVARCHAR(500),

@destinationFileVARCHAR(500)

--Start with file supplied by established operations

SET @rootSourceFile = 'C:\Files\SourceFileName'

SET @fullSourceFile = 'C:\Files\SourceFileName.txt'

--Get the time to stamp it with, then clean it up to YYYYMMDDHHMMSSMMM

SET @fileTimeStamp =...