Assuming that you have kept all the files that you have uploaded (as is recommended) then a quick way of checking the format of COMMENT and THEORY lines is: Open a CMD box and set default to the folder containing the files then findstr /i /c:comment *.* /i means ignore case differences /c: gives the search string Other options that may be useful are documented via findstr /? The output can be redirected to a file for later checking by appending >>filename Ken