I've installed Quartus Lite 3 times already. Every time, after two days, the shortcut is unrecognized and I can't open Quartus files anymore. Thanks, Ori.

Thanks for joining intel community forum.

I'm glad that you have the solution to your problem. Could you share your step/solution and maybe this could help others

of course. It was a problem with the Anti-Virus that deleted the .exe files.

After disable the software and re-install Quartus, it didn't happened again.