Files with the .mtx extension are most commonly used by the MadTracker audio tracker software. The MadTracker application is used to compose music on a user's computer. The MTX files contain plug-ins that install additional features into the software.
The .mtx file extension is also commonly used for Adobe Atmosphere files, marked text source files, Matrix spreadsheet files and Microsoft Visual Studio manual test text files.
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If you have additional information about the MTX file format or software that uses files with the MTX suffix, please do get in touch - we would love hearing from you.