Can't Open MaxBulk Mailer Files - OSX issue?

[iraaurit]

I have been using Max Bulk Mailer since 1998. I just noticed that I am not able to open a lot of my previous campaigns. Some are now listed as a Unix Executable Files, and others are just listed as Document. The ones that I can open are still listed as MaxBulk Mailer document.

MaxProg Tech Support says: "Have you tried to add the '.mbm' extension to the file names? You can then ask Mac OS X to hide the extension pressing command+I"

I tried this and it doesn't work. I called AppleCare who says their system did not change the file extensions.

Any suggestions?