fixpdf.cmd Julian Thomas March 10 2001. This is a free OS/2 Rexx command-line program. It removes one specific backward-compatibility problem between Acrobat 4 Distiller and Acrobat 3 Reader. The symptom of this problem is the message "Could not find the ColorSpace named 'Cs9'" or Cs6, etc. The program will attempt to fix your PDF file. If your PDF file has any other problem or uses any other Acrobat 4 (PDF 1.3) feature, it won't help that. Disclaimer: While it's been tested on a number of files by several Beta users, there are, of course, no guarantees. USAGE: fixpdf filespec [output file] If no output file is specified, the input file is copied as a .BAK file and the fixed file replaces the original file. If a filespec includes spaces (a practice that I believe should be avoided), the program will handle it correctly.