Process Explorer

Task Manager with the lid off: shows which process has a file open, which DLLs it loaded, and the full parent-child tree.

FreeProprietaryWindows

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Other download sites

Run by third parties, not by Microsoft Sysinternals. Prefer the official page above when it works.

Package managers

  • wingetwinget install --id Microsoft.Sysinternals.ProcessExplorer

About Process Explorer

Process Explorer answers the question Windows will not: which program is holding this file open so I cannot delete it. Type a file or directory name into its find box and it tells you the process and the handle.

The display is two panes. The top shows active processes as a tree with their parent relationships, so you can see what launched what. The bottom shows either the handles a selected process has open, or the DLLs and memory-mapped files it has loaded. It also verifies image signatures and can submit files to VirusTotal, which makes it a quick first look at something suspicious.

It is a Microsoft Sysinternals tool written by Mark Russinovich, distributed as a ZIP with no installation, and can even be run straight from Sysinternals Live.

Strengths

  • Finds which process has a particular file or directory open
  • Process tree shows parent and child relationships, not just a flat list
  • Shows open handles and loaded DLLs for any selected process
  • No installation; a 3.5 MB ZIP, or run it directly from Sysinternals Live

Limitations

  • Windows only
  • Closed source, though published by Microsoft
  • The amount of detail is overwhelming without some Windows internals knowledge
  • Replacing Task Manager with it is a setting people forget they changed

Details

Pricing
Free · Free to download and use, published by Microsoft as part of the Sysinternals suite. The source is not published.
License
Proprietary
Developer
Microsoft Sysinternals
Platforms
Windows
How it runs
Downloadable app
Account
Not required
Works offline
Yes
Best suited for
Finding out what a Windows process is really doing, or what is locking a file
Categories
System monitoring
Last verified
Added
Provenance
Selected from the TechWalrus downloads catalog (System Monitor); facts checked against the developer's own pages, 3 sources on file.

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