I downloaded craftbukkitSNAPSHOT.jar for Minecraft server. When I stop playing I want to delete it. HOW? I can't do it! It's says: "to start off all programs that use this program". And I deleted Minecraft. How to delete this f*****g file?!

Perhaps, you should restart your computer, that way, whatever the file was in use for will now be abolished as it has no processes to follow.

I usually look for the process in task manager. Delete it, then delete the file. Simple.

THANKS. It's work!