File Extension MTXDEF


File extension: MTXDEF
File type: Multiple Extension Definition (Définition d'extension multiple)

Notes about the MTXDEF 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 MTXDEF file type is primarily associated with 'Gestionnaire d'extensions' by Francis Gagné. This program allows you to open a file according to its extension (like Windows) or according to its contents (unlike Windows). It also manages multiple extensions in combination (e.g., .ABC.XYZ). [French site]

Detailed information for file extension MTXDEF:

Primary association: Gestionnaire d'extensions
Company: Francis Gagné

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.

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