Could be done quite easily with a small VBS script, something like:
' Define needed constants
Const ForReading = 1
Const ForWriting = 2
Const TriStateUseDefault = -2
' Get input file name from command line parm, if 2 parms entered
' use second as new output file, else rewrite to input file
If (WScript.Arguments.Count > 0) Then
strInFile = WScript.Arguments(0)
Else
WScript.Echo "No filename specified."
WScript.Quit
End If
If (WScript.Arguments.Count > 1) Then
strOutFile = WScript.Arguments(1)
Else
strOutFile = strInFile
End If
' Read file into an array
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFile = objFSO.OpenTextFile(strInFile, ForReading, False, TriStateUseDefault)
strData = objFile.ReadAll
objFile.Close
' Remove CR-LF pairs
strData = Replace(strData, vbCrLf, "")
' Rewrite file with any changes made
Set objFile = objFSO.OpenTextFile(strOutFile, ForWriting, True)
objFile.Write strData
objFile.Close