SprutCAM is sold in different versions for Tormach mills/lathes. One version will only work with encrypted post processor files, which have only work with the Tormach mill and maybe the Duality lathe, so far as I know. There is another version that will work with any mill or lathe (the "all machines" version). The former uses posts with ".ppl" file extensions and the latter uses posts with "spp" extensions.
The Tormach-only version can only use ppl files and the All-Machines version can only use spp files. Tormach might be able to upgrade you from one to the other version fairly cheaply.