This is not so much a help question as a curiosity, I hope that's OK. I found my self wanting to remove a group of files from recent document in my Application Launcher (Plasma Widget). Rather than go through them all with right-click and 'Forget Document' I thought it would probably be easier, in future, if I just knew where the list was in the config files.
So I opened an easily identifiable document, checked it had appeared in the Recent Documents list. I then used Kate to search all text files in my entire home folder entire for the name of the document. The only place it appeared was in Kate's own recent documents list in 'katemetainfos'. Nowhere else. ~/.local/share/RecentDocuments contains a completely different list to the one in the launcher, recently-us.ed.xbel contains another list entirely.
So I thought maybe it's a database of some sort, so I searched .xbel, .db, .sqlite in my home folder. Again, nothing.
I don't really need to know because I can just delete documents using the control menu, but my curiosity won't be assuaged. Where on earth is the list that Application Launcher uses?