What is a dm file and how do I open 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.
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How to open dm file on Microsoft.com