Software & Apps File Types What Is a DM File? DM files support several different, non-overlapping purposes By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated February 28, 2020 File Types Design Cryptocurrency MS Office Windows Linux Google Drive Apps File Types Backup & Utilities View More Tweet Share Email A file with the DM file extension is most likely a DRM Delivery Message file. It can be any file type but is usually an audio file used as a ringtone or media clip on a cell phone. They're sometimes downloaded to a computer, too. Since these files are protected with DRM (Digital Rights Management) copy-protection software, a cell phone must be authorized in order to use them. DRM Delivery Message files might be downloaded through an installation service and have an additional file extension preceding it, like file.sis.dm or file.sisx.dm. Other DM files may instead be Paradox Data Model format files used by the Paradox database software. DM is also an acronym for a number of other technical terms like a direct message in the context of online chat, Device Manager, digital media, document management, download manager, distributed memory, data model, and probably others. How to Open a DM File Sony Ericsson's DRM Packager can both open and create DM files that are DRM Delivery Message files. The program SISContents can open DM files too. Copy-protected DM files cannot be opened even if you transfer the file to a different phone. If the device uses hardware-based encryption, the file will only work on that specific device. Paradox Data Model files with the .DM file extension open with Paradox, which was acquired by Corel in the 1990s. Corel Paradox 8 was the first program from Corel that included Paradox, but they then published the software along with the professional versions of their WordPerfect Office software, but only in versions 9, 10, 11, 12, X3, X4, and X5. WordPerfect Office X4 Hot Fix 1 and X5 Hot Fix 1 are the latest versions that include Paradox. If you're not sure what program should be used, or the ones from above don't work, open your DM file as if it were a text file, using a free text editor. You can often find some sort of text within the file, often in the header (the first portion), to point you in the direction of the software that was used to create it, which is helpful for determining the software that can open it. How to Convert a DM File Audio files in the DM format cannot be converted to another playable format like MP3 because they're protected with special copy-protection software. Only the device that's authorized to play the file has rights to open it. However, you might be able to just rename the .DM file to .MP3 and play it that way, but only if it's a non-DRM file. If that works, you can run the MP3 through an audio file converter if you need it to be in some other file format. You can not normally just change a file's extension to something else and expect it to work in the new format. However, if your DM file is really just a renamed audio file, which is occasionally the case, then this trick should work just fine. For other file types where this can't be done, a free file converter is a way to go. If Paradox Data Model files can be saved to any other format, it's likely done through the Paradox software mentioned above. However, as we said above, you need the WordPerfect Office software in order to use Paradox. Still Can't Open Your File? If your DM file still won't open with any of these suggestions, make sure you're reading the file extension correctly. Some files use similar letters for the extension but have nothing in common and do not open with the same programs. One great example is DRM files. Take note that these are not DRM Delivery Message files but instead files that use the .DRM file extension, which are Deus Ex Data files or Cubase Drum Map files. In either case, they do not open with the same tools that can work with DM files, but instead use Deus Ex HR Tools and Cubase, respectively. DMG, DMA, DMC, and HDMP are similar in that they, too, do not behave like DM files and therefore open with different programs. Follow those links to learn more about those file formats, including how to open them and whether or not you can convert them to other file formats.