SDLPPX are not an alternative to SDLXLIFF, but rather a container ("package") for them (and possibly also Studio TM's and MultiTerme termbases). An SDLPPX is just a ZIP file, so you can change the extension from .sdlppx to .zip and you'll be able to see the content. Some CAT tools (eg. memoQ) support SDLPPX directly, ie. they can open them directly, as you can see <a href="http://content.screencast.com/users/dominique.pivard/folders/MemoQ/media/a733bdd1-b78e-455a-8563-f538350274bb/SDLPPX%20in%20memoQ%202013.png" target="_blank" rel="nofollow">here</a>. Other tools that support the SDLXLIFF file format can't open SDLPPX packages directly; it's the case of Wordfast Pro 3.2, for instance. If you are using Wordfast Pro 3.2 (or newer) and receive an SDLPPX that contains a bilingual file (SDLXLIFF), a TM (SDLTM) and a termbase (SDLTB), you'll have to manually unpack it first (as explained above) and convert the TM and the termbase also manually, for instance with WfConverter (as explain in this blog post). Hope this clarifies the matter.
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