Does not open *.bpi files

Question, after saving, the project file *.bpi does not open, and is not recognized as a Particle illusion file. I indicated what to open it with, but the program with the file still does not start. Please tell me how to open it, everything was opened before. Or are there limitations?

You can always use the File - Open Project menu once PI is open.

It’s possible that the .bpi files are not properly registered with the OS, or some security setting is blocking it.

Thanks for the answers! I didn’t find the reason, but after restarting the PC everything now works