What is a DSM file?
The .DSM file extension is used by multiple software programs. The main use is for security system design projects created by the RTS Security Design Tool. These specific .DSM files store project data using the standard JSON format. Another common use is for Nintendo DS emulator movies created by the DeSmuME emulator. These files record player inputs to replay gameplay later. Additionally, .DSM files can refer to Digital Sound Muxed movie files used by Media Player Classic, symbol map files for Borland CodeGuard, or Digital Sound Module audio files.
How to open DSM files?
The correct software depends on the file's internal format. If the file is a security project, you can open it with a simple text editor like Notepad++ because it contains plain JSON text. If the file is an emulator movie, you must load it inside the DeSmuME emulator. For media files, you can use Media Player Classic to play the video or audio.
Best practices and troubleshooting
Since the .DSM extension has multiple meanings, opening the file in a standard text editor is a good way to check its contents. If you see readable text structured with brackets, it is likely the JSON security project format. If you see random characters, it is a binary file like an emulator movie or a media file. Do not change the file extension manually, as this will not convert the internal format.
Software and tools
- RTS Security Design Tool
- DeSmuME
- Media Player Classic
- Notepad++
Summary
The viewer.online/dsm platform analyzes .DSM files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. Because .DSM files use the known JSON format, viewer.online/dsm can safely open and display them online, eliminating compatibility problems. If .DSM has multiple possible meanings, we recommend using viewer.online/dsm to identify the actual format of your specific file.