What you see is a yad dialog, but that's not what Furnace expects:
I can confirm that both Furnace-0.6pre1.AppImage and furnace-0.6pre7-linux.tar.gz run fine in Bookworm64, but the file picker does not work. Puppies, and I guess that EasyOS is no exception, have yad installed, often with zenity symlinked to yad. I've never seen an original zenity. AFAIK yad is a fork of zenity and *should* be compatible. Obviously it is not.
If you are really keen to go to the bottom, here is how zenity/yad is called from Furnace:
Code: Select all
zenity --file-selection --filename=/root/ --title Open File --separator= --file-filter compatible files|*.fur *.dmf *.mod *.fc13 *.fc14 *.smod *.fc --file-filter all files|* --confirm-overwrite
Yad doesn't understand --file-selection
. For yad it should be --file
. Some of the following options are also not understood by yad. Your best bet is to obtain an original zenity. Maybe copying it from the "Debian based system" would work?