You're here because you have a file that has a file extension ending in .mth. Files with the file extension .mth can only be launched by certain applications. It's possible that .mth files are data files rather than documents or media, which means they're not meant to be viewed at all.
what is a .mth file?
The MTH file extension is known as the Derive Math File which includes values and functions loaded by Derive. Derive is a computer Algebra system. It offers exact arithmetic, factoring, partial fraction expansion, equation solving, 2d and 3d colored plots, derivatives, integrals, differential equations, Taylor and Fourier Series, Laplace Transforms, vectors and matrices. It displays a blank interface to insert numbers, expressions, symbols and everything needed to create calculations. Files in MTH format can be opened with Texas Instruments Derive in Microsoft Windows platforms. DFW is another file extension used by Derive. It was available only for Windows and DOS platforms and was used also in TI pocket calculators because of its little memory. It was developed based on muMATH by the Soft Warehouse in Honolulu, Hawaii and later on owned by Texas Intsruments. It was discontinued in 2007 leaving Derive 6.1 as its last version. TI Nspire replaced Derive Math software.
how to open a .mth file?
Launch a .mth file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .mth file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .mth files aren't yet associated with it. In this case, when you try to open a .mth file, you can tell Windows which application is the correct one for that file. From then on, opening a .mth file will open the correct application. Click here to fix .mth file association errors
applications that open a .mth file
Texas Instruments Derive
Texas Instruments Derive
As of this writing, further development has been discontinued for Texas Instruments Derive, which is an educational application that was last sold in June 2007 by its developer, Texas Instruments, though support will continue to be provided by Texas Instruments to users of Derive. Similar features, compatibility support and functionalities that are available in the last version of Derive can be found in some of the recent applications from Texas Instruments. Most of these features and compatibility functionalities can be found in Texas Instruments Nspire among other latest releases from this developer, though improvements and upgrades of these functionalities have been incorporated into these applications. Texas Instruments Derive can still be found integrated or bundled with older hardware devices that were manufactured and released by Texas Instruments before mid 2007.
Be careful not to rename the extension on .mth files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.
what is a file extension?
A file extension is the set of three or four characters at the end of a filename; in this case, .mth. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.
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Find and repair file association errors preventing this file type from opening on your computer.