Windows - How to know which application locks a file/directory ?

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Sometimes when you want to rename a file or a directory, you receive this message :

Error Renaming File or Folder
Cannot rename : Access is denied

Make sure the disk is not full or write-protected and that the file is not currently in use.

First,

but very often, this message is caused by an other application which lock the file or the directory.

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How can I detect which application are concerned ?

With the use of process explorer, it's very easy. Just launch it and go in the menu to find / Find Handle or Dll. Tape a part of the name of you file or directory, hit the search button and you will have the list of all process which lock you.

Here below as example, I want to rename the name of the directory 404Manager but I can't and I can that is the IDriveEbackground that blocks me.

That's it !