How can I identify what application is using a given file? [duplicate]

How can I find out which process is locking a file or folder in Windows?

For instance, when trying to delete a folder, Windows reports this:

The action can't be completed because the folder is open in another program

Happens the same with a file, but how do I find out what program or application is currently using it and preventing me from deleting the file or folder?

PowerShell method:

if ((Test-Path -Path $FileOrFolderPath) -eq $false) {
    Write-Warning "File or directory does not exist."       
}
else {
    $LockingProcess = CMD /C "openfiles /query /fo table | find /I ""$FileOrFolderPath"""
    Write-Host $LockingProcess
}

The openfiles command needs to have support for local files enabled, by running openfiles /local on and restarting.

More details How to find out which process is locking a file or folder in Windows ^archive

You can use the Resource Monitor for this which comes built-in with Windows 7, 8, and 10.

1. Open Resource Monitor, which can be found
   • By searching for Resource Monitor or resmon.exe in the start menu, or
   • As a button on the Performance tab in your Task Manager
2. Go to the CPU tab
3. Use the search field in the Associated Handles section
   • See blue arrow in screen shot below

When you've found the handle, you can identify the process by looking at the Image and/or PID column.

You can then try to close the application as you normally would, or, if that's not possible, just right-click the handle and kill the process directly from there. Easy peasy!

A couple of options:

Microsoft/SysInternals Process Explorer - Go to Find > Find Handle or DLL. In the "Handle or DLL substring:" text box, type the path to the file (e.g. "C:\path\to\file.txt") and click "Search". All processes which have an open handle to that file should be listed.

WhoLockMe - Explorer extension which adds a right-click menu option

N.B. WhoLockMe appears to not work with Win 10 (at least I have been unable to register it with either of the 32- or 64-bit versions of regsvr32.exe).

Have a look at Process Explorer (procexp.exe).

From its introduction:

Ever wondered which program has a particular file or directory open? Now you can find out.

To find out what process is using a specific file follow these steps:

1. Go to Find, Find Handle or DLL.. or simply press Ctrl+F.

   

2. Enter the name of the file and press Search.

   

3. Process Explorer will list all processes that have a handle to the file open. Click on an entry to focus the process in the main window.

   

4. Optionally, you can then even close the handle manually through the lower pane (Ctrl+L):