file extensions

I changed folder options to view files extensions.

I then tried to change the file extensions on a couple of files and every time I tried to change an extension to a different type (i.e. *.htlm to *.rar) the explorer window freezes and shows not responding.

Has anyone else had this problem?

There could be many factors in this.

What files are you trying to change?
Have you installed any registry software?
Have you used any watermark cracks?
What are your full system specs? (click User CP to update your specs)

It's a very weird issue & we would like to be able to help you if you have this extra info.

Works for me, no problem