I always open up photo and editing with paint. But sometimes, I juz need to open with normal windows picture. So, it is very unconvenience to left click on file, and open with, and paint.

So, is it software can let me do like this,
1) Default, click ENTER is open using windows picture.
2) Click F1 open using paint.

Thanks in advance.

I use IrfanView, ver 3.85. It's very old and I got it years ago, but it works, so didn't bother getting a new version. Small, fast, free. Best of all, it need not be "installed". Just copy it to the hard disk and run.