You'll need to load the FTM file up in a version of FTM greater or equal to the version that created the file. If the computer has crashed, this probably means you'll need to install FTM elsewhere and update it.
Once opened in FTM, you just go to the file menu, export, and choose GEDCOM.
Once opened in FTM, you just go to the file menu, export, and choose GEDCOM.