File Extension Search

.dm File Extension

Developer: Open Mobile Alliance
File type: Message File
You're here because you have a file that has a file extension ending in .dm. Files with the file extension .dm can only be launched by certain applications. It's possible that .dm files are data files rather than documents or media, which means they're not meant to be viewed at all.

what is a .dm file?

The DM file extension is a data format known as DRM Delivery Message. DM files are generally audio files encoded with DRM (Digital Rights Management) copy-protection and they were invented by the Open Mobile Alliance. These are customized ring tones and media clips downloaded only for selected authorized cellular phones. Under the OMA DRM v1.0, DM files contain the content and the rights of the message to be delivered. For Sony Ericsson users, these files are created in the DRM Packager. However if it’s for Nokia users, these files are available from online Nokia Ovi Store and uses SIS.DM or SISX.DM file extension. Files in DM format can be opened with Sony Ericsson DRM Packager and SISContents in Microsoft Windows based systems. These files can be converted to MP3 or MIDI format and one way to unlock DM ringtones is by recording and saving the ringtone to a different format.

how to open a .dm file?

Launch a .dm 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 .dm 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 .dm files aren't yet associated with it. In this case, when you try to open a .dm file, you can tell Windows which application is the correct one for that file. From then on, opening a  .dm file will open the correct application. Click here to fix .dm file association errors

applications that open a .dm file

Sony Ericsson DRM Packager

Sony Ericsson DRM Packager

Digital Rights Management is a technology that is used in securing the distribution, promotion and sales of a digital media. It protects digital content through limited usage, like for instance in 3G, where operators and content providers need a method that will allow then to sell content without freely distributing it between devices. DRM is defined by the standards of Open Mobile Alliance (OMA). OMA DRM enables controlled consumption of digital media objects by letting content providers express usage rights like the ability to preview DRM content, to prevention of illegally forwarding downloaded DRM content from to other users, and in enabling super distribution of DRM content. Usage rights are controlled with DRM, these are defined for all types of content. Different rights from different users may be applied on the same content. DRM controls usage rights like the number of times it can be used, the period it can be used and the length of time it can be used. This kind of control enables content providers to create more subscriptions and pay-per-use models and will also stimulate mobile content based services.


SISContents is software used in unpacking, editing and signing of Symbian 9 SIS packages. It inspects the files that are contained in the package, and checks for certificates it was signed to and view the PKG script which describes the process of on-device installation. The contents of these packages may be edited and signed after the installation. Packages may be edited by modifying the name, vendor, version, type of installation, supported platforms for devices, software dependencies, and the files and components contained in the package may be added, replaced, deleted and change capabilities, UID3, SID of executables. Signed packages show information on certificates, its validity period, issuer, subject, and others, and they may be deleted from the package. It can also view and save installation PKG script, create SIS packages from PKG scripts, read and unpack contents and files from N-Gage packages, and also view, edit and extract images from multibitmap files embedded in the sis packages. It is compatible with Windows XP, Windows 2003 Server, Windows Vista, windows 2008 Server and Windows 7. Nokia S60 3rd, 5th Edition and Sony Ericsson UIQ 3.x platforms are also supported.

a word of warning

Be careful not to rename the extension on .dm 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, .dm. 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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