No joy. I reverted to the downloaded 8.12, updated the source and still gives the same nothing happens. Paint.net still opens but not Sigil. I am running from source so that might be why.
Open With with Sigil 2.6.2 with Qt 6.8.2 still works.
Code:
[3.28] main UI initialized...
[3.28] Hiding splash screen
[3.30] splash screen hidden
[3.30] Started up in 3.30 seconds with 2 books
Open: C:\Program Files\Sigil\Sigil.exe (file): C:\Users\<username>\Calibre\Intake\Courtenay Raia\The New Prometheans (950)\The New Prometheans - Courtenay Raia.epub (args):
cmd_line: "C:\Program Files\Sigil\Sigil.exe" "C:\Users\<username>\Calibre\Intake\Courtenay Raia\The New Prometheans (950)\The New Prometheans - Courtenay Raia.epub"
Running Open With commandline: '"C:\\Program Files\\Sigil\\Sigil.exe" "%1"' |==> C:\Program Files\Sigil\Sigil.exe "C:\Users\<username>\Calibre\Intake\Courtenay Raia\The New Prometheans (950)\The New Prometheans - Courtenay Raia.epub"
Running Open With commandline: '"C:\\Program Files\\paint.net\\paintdotnet.exe" "%1"' |==> C:\Program Files\paint.net\paintdotnet.exe "C:\Users\<username>\Calibre\Intake\Courtenay Raia\The New Prometheans (950)\cover.jpg"
[31.20] Shutdown starting...
[31.42] [Backup Configuration Folder]: starting backup process
[33.58] [Backup Configuration Folder]: wrote config backup to C:\Users\<username>\Desktop\Calibre Config Backups\backup-calibre\2025-10-04 at 19-53-49.zip. Size: 84,860,586 bytes.
[33.58] [Backup Configuration Folder]: finished
[35.61] Shutdown complete, quitting...