https://bugs.winehq.org/show_bug.cgi?id=54530
--- Comment #2 from hunt3rgz@protonmail.com --- (In reply to Nikolay Sivov from comment #1)
This function is already implemented, and should have been available in 8.1 too. Could you explain how to reach "create gradient" window, and where to download this application.
download: https://github.com/X-Hax/sa_tools
1. Open the program 2. Right click in any pallet 3. Click in the 'create gradient' option 4. Click in the save button, then you get the error