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How to open .SM files on Android

To open .SM files on Android, there is no common native Android app support referenced for StepMania .sm editing/playing; transfer the song folder to a desktop and open it with StepMania (play) or ArrowVortex (edit), or use a text editor app only to inspect the plain-text contents.

Step-by-step instructions

  1. There is no common native Android app support referenced for StepMania .sm editing/playing; transfer the song folder to a desktop and open it with StepMania (play) or ArrowVortex (edit), or use a text editor app only to inspect the plain-text contents.

Common issues

The .SM opens as garbled text or “unknown format” in a viewer

.SM is not a general-purpose “data” format; it is a StepMania simfile stepchart meant for StepMania-compatible engines or dedicated chart editors.

  1. Open it in StepMania (to play) or ArrowVortex (to edit).
  2. If you only need to read it, open with a plain-text editor and look for StepMania-style tags and chart sections.

Song loads but has missing audio/backgrounds or errors

A .sm typically references audio and other assets that must be present in the same song folder and correctly named/pointed to by tags.

  1. Confirm the .sm is in the same folder as the song’s audio file and any referenced assets.
  2. Open the .sm in a text editor and check that referenced filenames match the actual files (including spelling).
  3. If available, try loading the same song folder in another StepMania-compatible engine to rule out engine-specific limitations.

Charts don’t behave as expected (timing/notes) or advanced features are missing

.SM is supported but is largely superseded by .SSC in StepMania 5; some newer chart features/workflows may rely on .SSC instead of .SM.

  1. If you received both .sm and .ssc, prefer the .ssc when using StepMania 5-era content.
  2. If you are authoring content, consider using tools/workflows that target .ssc when you need newer features, while keeping .sm for compatibility.
  3. Test the chart in the target engine (StepMania or Project OutFox) to confirm what the engine supports for .sm.

Double-clicking doesn’t open the file in the right program

File associations may not be set, especially if you installed multiple rhythm-game tools or text editors.

  1. Use “Open with” and select StepMania or ArrowVortex depending on whether you want to play or edit.
  2. Set the chosen app as the default for .sm files if your OS offers that option.

Security note

.SM stepchart files are plain text and typically don’t contain macros like office documents, but they can still be risky if a game/editor has parsing vulnerabilities—only load charts from sources you trust.

Back to .SM extension page