Sorry for the trouble. I’ve updated the downloads ( https://sergilazaro.itch.io/pixelforge#download ) so that PixelForge now has one extra menu entry in the Help menu, to create a diagnostics Zip file.
If you’re up for it, can you install this latest version (that’s the only change it has) and try to open a PXF file that isn’t opening, and then generate the Zip file to send to me? That would be very helpful for me to diagnose the problem 🙏