Weird "Kill" Command thing

Hey, this is somewhat VB related since I have to use VB to delete files from my computer now. In win explorer I select the file and try to delete it. It gives me the message that it cannot delete or move the file because another person or program is using it. However, I know nothing is using it! I even restart the computer in safe mode without networking and try to delete and still get the same results. So I finally got pissed and loaded up VB and just did a quick "kill" command on the form_load event. That worked it deleted the file! What is the deal with this? I'm using Win XP Home w/ SP2. Any help appreciated. Also, I'm not using thumbnails in folder so it's not using the thumbs.db file.

What is the file extension?

The extension is .avi. The file I was trying to delete was a DivX file.

windows will try to get all the information it can from an AVi file (bitrate, FPS, quality), it will also try to provide you with a mini preview of it. Maybe this was why you couldn't delete it.