Hmmm.. Two resources for file extensions.. http://webopedia.internet.com/quick_ref/fileextensions.html http://www.computeruser.com/resources/dictionary/filetypes.html Only the top one has it listed as Max source code file ... still not a lot of help. But this may be http://www.walden.org/Tips.htm#File%20Types At the bottom .. PaperPort Files. HTH, Michele Google: MAX file extension ----- Original Message ----- From: "J. Blanchard" <jay.blanchard at thermon.com> | I had an associate send a file with the .MAX extension, but cannot seem to find a way to open the file. Appreciate the help in advance.