How to Open a TMP File (or Safely Delete It)
A .tmp file is a temporary file that a program, or Windows itself, creates while it works. It is not a document format you are meant to open by hand.
A .tmp file is a temporary file left behind by a program or Windows. You usually do not open it. Recover your work from the app that made it, or delete the .tmp safely to free up space.
That covers most searches. The sections below cover recovering your work, identifying the source, and clearing .tmp files out safely.
Why you have a .tmp file in the first place
Most people land here after finding a .tmp file they do not remember creating. That is normal. Temporary files build up quietly in the background.
A .tmp almost always falls into one of three situations, and each one calls for something different.
- It is leftover after a crash or a program that closed early. This case is usually safe to delete.
- A program is using it right now. Leave it alone while that app stays open.
- It holds recoverable work, such as an unsaved Office document.
Figure out which one applies before you act on anything else here.
Recovering unsaved work in Word, Excel, or PowerPoint
If you just lost a document, start here before you go looking for a .tmp file at all.
Use the app’s own recovery feature, not the raw .tmp file. Office often keeps unsaved work as .tmp or .asd files behind the scenes, but opening one of those directly rarely gets you anywhere useful.
In Word, the path is:
- Open Word and click File.
- Click Info.
- Click Manage Document.
- Choose “Recover Unsaved Documents.”
Excel and PowerPoint keep the same option in their own File menu. This route finds a lost draft far more reliably than hunting through temp files by hand.
Finding and identifying your temp files
Most temporary files sit in one place, which makes them easy to check.
Type %temp% into the File Explorer address bar, or press Windows key + R and type it there, to jump straight to the folder.
Once you are there, the name and location of a file often reveal its source.
Names starting with a tilde, like ~WRD0001.tmp, are usually Office working files. Other apps leave their own clues in the name instead.
You can also right-click a .tmp file and open it in Notepad to peek inside. Most show scrambled binary text, which is normal, but sometimes you will spot readable words naming the source app.
Confirm you are seeing the real extension before you rename anything. If Windows is hiding it, the steps for showing file extensions in Windows reveal the true name.
A .dat file causes the same kind of guessing game. The guide to opening a DAT file walks through identifying it step by step.
That detective work is often all you need before deciding what happens next.
Renaming or deleting a .tmp file safely
A .tmp file is safe to rename only in specific situations, so check before you commit to it.
Only rename a .tmp file if you know exactly which app made it and the file is complete, not partial. Renaming it to its real extension, like .docx or .jpg, can work once you are sure.
A partial or in-progress file stays broken after renaming. Renaming only changes the label, not the missing data inside.
When in doubt, deleting is almost always the safer choice.
Old .tmp files do nothing useful once their program has closed, and they just take up space. Windows 11 can clear them out in bulk without touching anything still in use.
- Open Settings.
- Go to System, then Storage.
- Select Temporary files.
- Tick the boxes for what you want removed.
- Click Remove files.
Storage Sense can repeat this automatically on its own schedule. The older Disk Cleanup tool works too, if you already know it.
Skip any .tmp file that belongs to a program you currently have open. Close that program first, then come back to it.
Never rename a .tmp file to .exe and run it. A stray .tmp from an email or a random download can be malware wearing a harmless extension. If you did not create it and did not expect it, delete it instead.
Frequently asked questions
Short, direct answers to the most common .tmp questions.
Can I open a .tmp file directly?
Not in any useful way for most files. Recover your files from the source app, or figure out where the .tmp came from, rather than double-clicking it directly.
What program opens .tmp files?
No single program owns the format. Whatever app or process created the file is the one that can actually read it.
Is it safe to delete .tmp files?
Yes, in almost every case. The one exception is a temp file that belongs to a program you have open right now, so close that program first.
Where are temp files stored on Windows?
The Windows temp folder holds most of them. Type %temp% into File Explorer or the Run box to jump straight there.
How do I recover a Word document from a .tmp file?
Skip the raw .tmp file. Use Word’s own File, then Info, then Manage Document, then “Recover Unsaved Documents” instead. Office often stores unsaved work as .tmp or .asd files behind the scenes.
