Apple pays little attention to these user-to-user forums--probably least of all to what is said here in a forum devoted to the long-retired System 7, OS8, OS9, and their equally out-to-pasture applications. You can, however, send feedback directly to Apple via this portal: https://www.apple.com/feedback/.
I'm not sure what you would want OSX 10.* to do. Think about it. You no longer have a functioning version of the program available to the OS. Consequently, the OS can't pair the GlobalFax files with the application that produced them or with any comparable application. Byte for byte, the GF fax files are the same as they always were, but when a suitable program can't be found to read them, the OS reports them as "unix executable" as a Kind of last resort. Perhaps "none" would be better? I don't know.
But glancing through an online GlobalFax manual (p. 60)-- http://modems.globalvillage.com/support/pdfs/GlobalFax_Users_Guide.pdf --I note that faxes saved through GF could be of only a few types: GlobalFax 2.5/2.6 (a proprietary format? likely some flavor of TIFF?), MacPaint, PICT, PICT2, or TIFF. Two quick tests. First, add .tiff or .pict or .pct to a GF fax filename. Then try to
(1) open in Preview, or
(2) open a new TextEdit document, set it to rich text mode (if it isn't already), then drag/drop the GF fax file directly into the blank TextEdit document.
Might work. But my recommendation for File Juicer stands. It's a handy tool to have on hand if you often deal with old files from vintage applications.
