What is the UPX File Extension?

Author:   |   Revised: November 26, 2018

Microsoft Silver

UPX File Summary

File Extension UPX has two unique file types (with the primary being the Ultimate Packer For eXecutables File format) and is mostly associated with PeaZip (Open Source) and two other software programs. Generally, these files are considered Compressed Files, but they can also be Raster Image Files.

File Extension UPX is supported by Windows and Linux operating systems. These types of files can be found on both desktop and mobile devices. UPX files have a "Low" Popularity Rating; this means that they are not present on most devices.

To learn more about UPX files and their associated software applications, please see the information below. Plus, we provide a basic troubleshooting guide to solve problems with opening UPX files.

Low
Prevalence
4837
Order

/ 11690

Active

State

26

November

2018

Amended

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Types of UPX Files

  2 known file types use this extension

Chief UPX Description

.UPX
Extension:.upx
Class:Ultimate Packer For eXecutables File

Executable compressed file created by Ultimate Packer for eXecutables (UPX), an application used to compress executable files (such as .EXE files) to reduce their sizes during transporting via Internet.

Organization: Open Source
File Category:Compressed Files
Subkey: HKEY_CLASSES_ROOT\.upx

Software Programs That Open The Ultimate Packer For eXecutables File:


PeaZip by Open Source

Windows
Linux

Ultimate Packer for eXecutables (UPX) by Open Source

Windows
Linux

Additional UPX Files

.UPX
Extension:.upx
Class:Ulead Photo Express Saved Image File

Raster image file contains saved image file created by Ulead Photo Express, a photo editor software for home users that is able to easy edit and share digital photos.

Organization: Ulead Systems
File Category:Raster Image Files

Software Programs That Open Ulead Photo Express Saved Image File Files:


Ulead Photo Express by Ulead Systems

Compatible with:

Windows

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UPX Popularity


Browser Hierarchy

Chrome (58.80%)
Firefox (11.05%)
Internet Explorer (9.04%)
Edge (8.46%)
Safari (3.87%)


Sources of UPX Problems


Typical UPX Opening Challenges

PeaZip Isn't There

You attempt to load your UPX file and get an error such as "%%os%% Can't Open The UPX File Extension". When this happens, it is commonly due to PeaZip missing in %%os%%. This will prevent you from double-clicking to open the UPX file because the OS doesn’t know how to handle it.


Tip: When you have another program installed that you know will open your UPX, you can select it from the other programs listed (see "Show Apps").


PeaZip is Out-of-Date

In some cases, you might have a newer (or older) version of a Ultimate Packer For eXecutables File file that is unsupported by your installed application version. If you've got the wrong version of PeaZip installed, you'll need to install the correct version. This issue mainly occurs when your Ultimate Packer For eXecutables File file was created by a newer version of PeaZip than you have on your PC.


Tip: Right-clicking on your UPX, then clicking "Properties" (Windows) or "Get Info" (Mac), can provide clues about your file version.


Ultimately, most of the difficulties opening UPX files are due to having the wrong version of PeaZip installed.


Associated Difficulties Loading UPX Files

In the majority of cases, installing the right version of PeaZip will resolve your issue. If you are continuing to have errors with loading UPX files, other external issues might be to blame. Problems unrelated to software:

  • Corrupt Windows Registry file path references for UPX
  • Deletion of the UPX file description from the Registry by mistake
  • Incomplete or bad installation of a software application associated with the UPX format
  • File corruption affecting your UPX file
  • Your UPX has adversely impacted by malware
  • Drivers associated with UPX software need to be updated
  • Your PC doesn’t have enough available resources to open the Ultimate Packer For eXecutables File file

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