I've looked through many similar questions, but no one seems to have had this same problem. I can open the IDLE shell perfectly fine from the start menu. Once in, I can use File->Open to open any .py file.
However, my problem is that if I try to open any .py file from File Explorer with IDLE, the files will run, but the IDLE application won't come up. This especially makes it difficult to quit running when I can't even close the application if it's not open. It also makes it very tedious if I have to always use File->Open from the IDLE shell if I want to open a .py file. How can I at least get the Edit with IDLE option to come back?
I had this same issue and came looking for an answer, but ended up figuring it out: I had the issue when I downloaded the 64-bit version for windows (3.9.7), but the issue was resolved when I instead installed the 32-bit version of 3.9.7. Now I can right-click > "Edit with IDLE"