.DM File Extension

DRM Delivery Message

Developer Sony Ericsson
3.8  |  74 Votes

What is a DM file?

A DM file is a file that has been copy-protected by Sony Ericsson DRM Packager or another Symbian OS mobile phone DRM app. Most often, DM files contain a ringtone or other audio clip. However, some DM files contain a digitally signed mobile app. DM files can be installed only on an authorized cell phone.

More Information

The Nokia Ovi Store is a notable source of DM files. Typically, the Ovi Store downloads and installs DM files in the background, so users will never encounter them. However, users sometimes download DM files manually, using an app like the Ovi-Store add-on for the Opera web browser, and save them to their computers. Users can then install these DM files using Nokia Ovi Suite.

For example, users might encounter DM files saved with the .SIS.DM and .SISX.DM extensions. These files are copy-protected .SIS and .SISX files, which often contain apps downloaded from the Nokia Ovi Store.

Sony Ericsson phones also use audio files and apps saved as DM files. Both types of phones use Symbian OS, so the DM files they use are similar.

How to open a DM file

You can open SIS.DM and SISX.DM files with SISContents (Windows), a tool that allows you to unpack Symbian OS SIS packages. Before doing so, you must:

  1. Open the file in a hex editor and delete its first four lines of text.
  2. Rename the file to use the .sis or .sisx extension.

You can attempt to open other DM files in a similar manner (by deleting the files' first four lines of text, renaming them to use an appropriate extension, and opening them in an appropriate program).

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Programs that open or reference DM files

BYOND Dream Maker Code

Developer BYOND
3.5  |  16 Votes

A DM file may also be a code file used by BYOND Dream Maker, a free online multiplayer game creation platform. It contains code written in BYOND's DM programming language. DM files are included within BYOND Dream Maker projects; Dream Maker compiles a project's DM file(s) to produce a working video game.

More Information

Build Your Own Net Dream, better known as BYOND, is a game development engine that can be used to create, play, and publish multiplayer video games. To do so, developers download BYOND and use BYOND Dream Maker to write their games in the program's unique DM programming language. Developers save a game's code within DM files, which Dream Maker uses to compile all the code within a project and run the developer's game.

A BYOND Dream Maker project can include any number of DM files. Simple games might consist of just one DM file, while complex games might consist of multiple DM files that define only certain aspects of a game.

How to open a DM file

You should open a DM file in BYOND Dream Maker (Windows, Linux), as it contains language-specific tools that will help you edit the DM code contained within the file. However, because DM files are plain text files, you can also open and edit them in any text editor if needed.

Programs that open or reference DM files


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