I copied 3 files to a 3.5" floppy from an old DOS pc. One of the files reads fine on my WinXP box, but the autoexec.bat and config.sys files will not read. I've tried several disks on 2 different pc's with the same result. I turned on "Show All" in the files options, but that didn't help. How can I read these files on an XP machine?