File Extension MUD

.MUD File

File extension: MUD
File type: ACT!


Notes about the MUD file extension:



To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The MUD file type is primarily associated with 'ACT!' by Best Software CRM Division. Windows ver 2. Popular contact management software.

Detailed information for file extension MUD:


Primary association: ACT!
Company: Best Software CRM Division

Other applications associated with file type MUD:

  • Yahoo! Mail (Saved Attachment)This is not an official file extension but sometimes is seen when an attachment in a Yahoo! Mail message is saved to disk. One of their mail servers is named web34303.mail.mud and sometimes that name or one similar to it is made part of the saved file's name. If you know what the attachment's file type was supposed to be rename the file with the proper file extension and it should open in the proper program.
  • zMUD (Settings File) by Zugg SoftwareMUD stands for Multi-User Dungeon, Multi-User Domain, or Multi-User Dimension. Regardless of what it stands for, a MUD is an online environment where multiple users are logged on and interacting with one and other. There is a related MUD eXtension Protocol for enhancing the communication between MUD servers and clients. Related links: MUD eXtension Protocol



To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

Technical data

To view technical data on file-extension MUD click this link to expand/hide the additional area.

System Info for File Extension .MUD

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.

ProgramID: mudFile
EXEFile: %ProgramFiles%\MSC~1.SOF\MSC~1.MAR\2005\MENTAT~1\bin\mentat.bat


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