Does LO open and save WordPerfect files?

Including QuattroPro files also?

Do not have a WordPerfect file to try it on. However, it appears you can simply rename the file to a .doc file and MS or LO will open it.

I can’t see it being perfect, there might be some special characters missing or showing up, causing some formatting issues.

LibreOffice will open some Quattro Pro files, but not all (depending on how old). Otherwise there are separate converts available or download WordPerfect trial version and convert them with it before the free trial runs out.