From The Document Foundation Wiki
- psprint: may contain a "driver" subfolder (which may be empty), a "fontmetric" subfolder (which may be empty), and a "pspfontcache" file (in which printer fonts are cached). The "psprint" folder may be missing entirely. If it is present, it may be deleted without ill effect. If it is deleted, it will not necessarily be recreated.
- registry: contents the most part of the configuration files.