Is there a Sacred Gold character editor for PAK files, because all the ones I find are for the other filetype PAX; for example, my save game for Sacred is:

GAME01.PAK

So, is there something I can use to edit my char with it?!

like this?
https://www.nexusmods.com/sacred/mods/1

That is one of the ones that edits *.PAX files. The GoG version saves in *.PAK file format and is not compatible. Is there one that edits *.PAK files?

Chastain

Have you tried just changing the PAK extension to PAX and seeing what happens? Might work.

Seems to indicate there should be a pak and a pax:
https://www.gog.com/forum/general_archive/sacred_gold_save_query

Spooky word-for-word recreation of this thread back in 2009 (I can only assume you might be the same person who saw no help on IGN back in 2009 and all I can say is... I admire that dedication to finding an answer) - https://www.ign.com/boards/threads/is-there-a-sacred-character-editor-for-pak-files.181426001/

Subsequently, the PAK and PAX differences appear to be that of one for game saves and the other for hero exports - https://gamefaqs.gamespot.com/boards/915057-sacred/43031755

This deals with extraction of PAK files (with a focus on the Steam release, but I have to believe you can adapt it with the GOG release as well) - https://docs.larian.game/Pak_Extractor_Guide