A description of VDP registers would help.
Gnome thumbnails not working in XFCE
Now I noticed that RECOIL's MIME definitions can override freedesktop.org's, so that's what next RECOIL will do.
Gnome thumbnails not working in XFCE
I installed Xubuntu 25.10, recoil-2png_6.4.5-1_amd64.deb and recoil-thumbnailer_6.4.5-1_all.deb and it's working fine. Your problem is that the system has a built-in mapping of *.SCR as "Windows or DOS program". One way to get rid of this mapping is: sudo nano /usr/share/mime/packages/freedesktop.org.xml search (Ctrl+W) for *.scr comment-out this line as in the attached screenshot exit&save the editor (Ctrl+X, Y) sudo update-mime-database /usr/share/mime After that, you should see the thumbnails...
We cannot have unicode inside SAP. Why not? Long time ago, Jakub Husak proposed changing the whole SAP header to UTF-8.
Support STIL information in ".stil" co-files
I originally opted for STIL information in SAP files as extra tags. Ramos (RIP) wanted a plain text file, like HVSC did. 1) 2) I don't see what's the issue? You can mass-import to temporary storage, then merge to STIL.txt 3) tools/validate-stil.bat in ASMA repo checks if the filepaths reference to actual files