---> Is there an app that I can use to be able to read the PC readable Family Tree Maker files?
The only answer I can give you is "maybe."
The current version of Family Tree Maker for Macintosh can read Family Tree Maker for Windows files and vice-versa. Simply launch Family Tree Maker for Macintosh on your Mac, select OPEN A FILE, and then select the files that came from Family Tree Maker for Windows.
HOWEVER, that was not true of older versions of Family Tree Maker for Macintosh. The 2 programs used to be incompatible. Unfortunately, I do not remember the date that it changed. Perhaps someone else can chime in here and supply that info.
In any case, I'd suggest you try it to see if your versions re compatible.
Next, if that doesn't work and if you can find someone with a computer that will read those files, ask him/her to do so and then generate a GEDCOM file and send that to you. All modern genealogy programs on Windows, Macintosh, or Linux can read and write GEDCOM files generate by any computer.