Tips to open MUL file

Can't open the MUL file? You are not the only one. Thousands of users face similar problems every day. Below you will find tips on how to open MUL files as well as a list of programs that support MUL files.

MUL file extension

File Name Ultima Online Multi Format
File Developer Origin Systems
File Category Game Files

The MUL file is supported on 1 operating systems. Depending on your operating system, you may need different software to handle the MUL files. Below is a summary of the number of programs that support and open the MUL file on each system platform.

Operating systems
  • 3
  • 0
  • 0
  • 0
  • 0
  • 0

What is MUL file?

The file with the extension MUL is the Game Files file type. It was designed by Origin Systems. In addition to this file, the Game Files category includes 1509 related files. Ultima Online Multi Format is supported by 1 operating systems. The file will work on Windows systems, unfortunately not on others. This file type can also be opened by 2 other programs. You can use MulPatcher, Ultima Online in case MULTool cannot be used.

How to open MUL file?

An often recurring problem with Ultima Online Multi Format is that MUL is not associated with the correct program file. This is manifested by the fact that MUL files open in unusual applications or do not have an assigned program. How to solve such a problem?

The first thing you should do is just "doubleclick" on the MUL file icon you want to open. If the operating system has an appropriate application to support it and there is also an association between the file and the program, the file should be opened.

Step 1. Install MULTool

The first step is to check if the computer has the MULTool program installed. The easiest method is to use the system search engine by entering the program name MULTool in it. If it is not, installation may solve the problem, as most applications create file associations during installation. Below you will find a list of applications that support MUL files.

Programs to open MUL file

Remember to download programs supporting MUL files only from verified and safe sources. We suggest using the websites of software developers.

Step 2. Create association of MULTool with MUL files

If the application is or has been freshly installed, but the MUL file still does not use the MULTool program, it means no association. It is most convenient to call the context menu with the right mouse button and select Properties. Information about the file and the program that the file is associated with are available here. Using the "Change" button we can select the desired program. If there is no software on the list, simply select "Browse" and manually select the directory where the application is installed. The "always use the selected program ..." field will set the MULTool application as the default for handling the MUL file.

Step 3. Update MULTool to the latest version

If, despite the association of the MULTool program with the Ultima Online Multi Format file, the file still does not open, check the program version and possibly update it to the newest version.

Step 4. Check for the following problems with the MUL file

The problem may also be with the file itself if the above steps don't work. This could be due to the file itself, the cleanest issues are:

Very often, the file may be size 0 or incomplete. This is most often caused by a problem while downloading the MUL file. The file should be downloaded again, making sure that the process has finished correctly.
The operating system may be infected with a computer virus. A virus scan using an up-to-date antivirus program should fix the problem. Some antivirus vendors also provide free online scanners. The scan should cover the entire computer, not only the MUL file that we want to open. As a result of the scan, sometimes it is not possible to recover MUL files, which are deleted if there is a backup of this file, then after restoring it, it must also be scanned.
A typical compatibility error - the program does not support the older version of the MUL file. These problems are known and are often very easy to fix using the software developers's website.
There can be many reasons for the failure. Depending on the type of file, it is necessary to repair it accordingly. Some programs offer the option of recovering data from damaged MUL files.
The program indicates that the file is encrypted or corrupted. The encrypted MUL files can be used by the device on which they were encrypted, on any other device it is required to have the appropriate cryptographic key and decrypt the file before its recovery.
Some of the system directories are excluded from modification. The problem is only writing to the file, not reading it. It is best to move MUL to a different directory.
This problem only occurs with more complex files. In this case, the MUL file is blocked by the first application to open it. Running programs (including those in the background) should be verified. If the error persists after closing other programs, wait for a while. However, some background programs may block the MUL file while scanning. If the problem persists, restart the machine.