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Editorial Team
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Asked: 2026-05-25T16:39:08+00:00

How can I find out which process is using my file when I get

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How can I find out which process is using my file when I get such an error on the Build :

Error 18 Unable to copy file “Some.dll” to “bin\Debug\Some.dll”. The
process cannot access the file ‘bin\Debug\Some.dll’ because it is
being used by another process.

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  1. Editorial Team

    This is definitely a trick I’ve had to use before.

    I have all of SysInternals utilities in a folder that I’ve added to my PATH variable.

    Specifically, you can use handle available here to find what has the file open, then use PsKill available here to nix the culprit!

    EDIT

    here’s an example output

    C:\Users\jschubert>handle wowza.txt

Handle v3.46
Copyright (C) 1997-2011 Mark Russinovich
Sysinternals - www.sysinternals.com

Acrobat.exe        pid: 6800   type: File           284: C:\Users\jschubert\Desktop\something!\wowza.txt

C:\Users\jschubert>pskill Acrobat.exe

PsKill v1.13 - Terminates processes on local or remote systems
Copyright (C) 1999-2009  Mark Russinovich
Sysinternals - www.sysinternals.com

Process Acrobat.exe killed.
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