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How to open .DMS files on Mac

To open .DMS files on Mac, treat .DMS as an Amiga DMS compressed disk image; macOS usually won’t open it directly as a document.

Step-by-step instructions

  1. Treat .DMS as an Amiga DMS compressed disk image; macOS usually won’t open it directly as a document.
  2. Decompress the file using a DMS decompressor such as xdms (command line), producing a disk image file.
  3. Load the extracted disk image into an Amiga emulator (see the software suggestions referenced by FileInfo).

Alternative methods

  • Open .DMS in a browser-based viewer if desktop apps fail.
  • Try opening .DMS on Mac with a secondary app to rule out app-specific issues.
  • Convert .DMS only with trusted tools when direct opening is not possible.

Common issues

The .DMS file won’t open like a document

Many .DMS files are not documents at all; they are Amiga DMS compressed disk images. Trying to open them in a document editor/viewer will fail.

  1. Verify where the file came from (e.g., an Amiga game/demo archive strongly suggests a DMS disk image).
  2. Use a DMS decompressor (such as xdms) to extract the disk image instead of using a document app.
  3. After extraction, open the disk image in an Amiga emulator (software options are listed by FileInfo).

Extraction fails (password/notice or corrupt download)

Some DMS images may be created with a notice or password requirement, and extraction can also fail if the file is incomplete or damaged.

  1. Re-download or re-copy the file to rule out corruption/truncation.
  2. If prompted for a password/notice, follow the instructions included with the file/source; if you do not trust the source, stop and do not proceed.
  3. Try extracting with a known DMS tool (e.g., xdms) and review its error output for clues.

You extracted a file but don’t know how to use it

After decompression, you usually get a disk image intended for use in an Amiga emulator rather than a regular desktop file you can open directly.

  1. Check the extractor output to see what file was produced (the extracted disk image is what you load).
  2. Open the extracted disk image in an Amiga emulator (see FileInfo for examples of software that can use DMS images).

Security note

A .DMS is an archive-like container for disk contents; once extracted and used in an emulator, it may contain executable Amiga programs. Only run software from sources you trust.

Back to .DMS extension page