.MTXT File Extension
What is an MTXT file?
Text file created by MOPEKS, a program that generates multiple programs run by its script to use each other to solve problems; contains trial problem data; when it's clicked, the application references the data to run a trial to solve the problem;
When you open the MOPEKS application for the first time, a window will open asking if you want to make the MTXT file associated with the MOPEKS program, click Yes.
MTXT files are located in one of the class folders found in C:\MOPEKS\Library\Problems User.