A temp directory or temporary folder is a directory on a storage medium, such as on a hard drive, used to store temporary files. Commonly, this directory is named TEMP and may contain files ending with .tmp. AppX is the application distribution file format. Files with an APPX extension are basically an application package ready for distribution and installation. Traditional computer applications have relied on clunky installers called wizards to sort out and set up the components of a program, but this paradigm does not work well across multiple mobile platforms. The AppX approach is particularly effective for distributing applications suited for multiple devices, including PCs, tablets, and smartphones.

Low Disk Space error due to a full Temp folder

If you’re faced with this Low Disk Space problem, you’ll need to reset the Store by running the Windows Store Apps troubleshooter, clear the Store cache, and run the Windows Update troubleshooter and see if that helps to resolve the issue. Below are the steps in the order that you can take to fix the issue. 1] To run the Windows Store Apps troubleshooter to reset Microsoft Store, do the following:

Select Start  >Settings  > Update & Security  > Troubleshoot.Then scroll down and select Windows Store Apps from the list,Select Run the troubleshooter.

2] To clear the Microsoft Store cache, do the following:

Press the Windows Logo Key  + R to open the Run dialog boxIn the Run dialog box, type wsreset.exe and hit Enter.

A blank Command Prompt window will open, and after about ten seconds the window will close and the Store will open automatically.  3] To run the Windows Update Troubleshooter, do the following:

Select Start  > Settings  > Update & Security  > Troubleshoot.Then scroll down and select Windows Update from the list.Select Run the troubleshooter. 

4] Reboot your computer and see if you are still experiencing the Low Disk Space issue. Hope this helps!