TMP File

What is a TMP file?

A TMP file is a temporary file created by an operating system or application while it’s working. TMP files can store cached data, partial downloads, backups, or in-progress edits. Some are deleted automatically when a program closes—others can be left behind after crashes.

Common uses

• Temporary storage while an app runs
• Autosave or recovery data for documents
• Installer and update working files
• Browser/app cache files
• Partial downloads or exports

How to open a TMP file

• Best method: Identify which app created it (location + filename clues)
• Try: Open with a text editor (some TMP files are plain text)
• Tip: If the TMP file is in use, close the app before deleting

Common problems

• TMP files piling up and taking disk space
• Deleting a TMP file that’s still in use can break a process
• Recovery files may be needed after a crash
• Some TMP files are actually other formats with a temporary name
• Hard to identify the creator if it’s old

History

Temporary files have been part of operating systems for decades as a simple way for programs to store working data. Modern apps still use TMP-style files for caching, autosave, and safe write operations.