File Extension Library

.MUL File Extension

  • Developer by: Origin Systems
  • Category: Game Files
  • Format: Binary

What is an .MUL file?

.MUL file extension is created by Origin Systems. .MUL has been classified as Game Files. The format of .MUL file is Binary.

.MUL is Ultima Online Multi File

Game file used by Ultima Online, one of the earlier massively multiplayer online (MMO) games; may save various kinds of data, including graphics, animation data, maps, and game items; also used for applying game patch updates.

Sometimes Ultima Online users modify the contents of MUL files to alter gameplay. Tools such as MULTtool, Multibuilder, and MulPatcher can be used. However, since Ultima Online is an older game, some of these programs may be difficult to run on recent operating systems.

List of all softwares that can open the Ultima Online Multi File
Multi Operations Utility
File Type 2:

Deus Ex: HR Multiplexed Audio File

Developer by: Eidos Interactive Category: Game Files Format: Binary

Audio file used by Deux Ex: Human Revolution (DXHR), a first person role-playing game; saves audio data in a native format used by the game; can be demuxed to the FMOD .FSB format using Gibbed's Deus Ex HR tools.

List of all softwares that can open the Deus Ex: HR Multiplexed Audio File
Gibbed's Deus Ex HR tools
Eidos Interactive Deus Ex: Human Revolution

How to Open .MUL file on different platforms

Open .MUL File on Windows

  • Right-click a .MUL
  • Left-click "Open With" > "Choose another app"
  • Select the program that opens .MUL file and Select check box "Always use this app to open .MUL files" Press "Ok"

Open .MUL File on Mac

  • Right-click (or Ctrl + Left-click) the .MUL file
  • Click "Open With" > "Other.."
  • Then choose another program from the app list and press "Open"
  • Select check box "Turn on" for "Always open in app"

Open .MUL File on Linux

Right click on the .MUL file, choose "Open with" and select a program from the list above

Open .MUL File on iPhone

Select a file. If you don't see an application to open the .MUL file, tap "Share" and choose the right app.
Method 2
Save the file. Then open the app «Files». Touch and hold the file, then release your finger. You will see a black menu bar. After that tap "Share" and select an application.

Open .MUL File on Android

Tap the Settings icon on an Android smartphone, then select «Applications». Click the Settings icon in the upper right corner of the screen, to change the default apps.
If you want to open, edit, save or even convert .MUL files on Android, then your best bet is to download one of the dedicated apps available on Google Play.

How to fix problems with .MUL files

  1. You need to update the application that you normally use to open .MUL files. Only the latest version of the software supports the current .MUL file format
  2. You need to check the .MUL file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)