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.SM file extension

To open .SM files on Windows, if the file is part of a song folder, keep the .sm alongside its audio and assets, then open that song in a StepMania-compatible game (e.g., StepMania) to play it.

To open a .SM file, use a StepMania-compatible rhythm game (to play) or a stepchart editor like ArrowVortex (to view/edit). If you only need to inspect it, you can also open .SM in a plain-text editor because the format is text-based.

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Last updated: June 11, 2026 · Reviewed by Julian Stricker

What “reviewed” means on this page
  • Format fit: whether the “what is this file?” description matches common real-world use of the extension, including category, typical MIME types, and aliases.
  • Opening paths: whether Windows / macOS / Linux steps read plausibly for current OS dialogs and default apps; we remove fantasy menus and unsafe shortcuts.
  • Security framing: whether risk notes match the extension class (for example executables vs plain data) and whether affiliate wording does not contradict the security section.
  • Sources and further reading: whether external links point to vendors, standards bodies, or other primary references where possible; we avoid inventing details we cannot ground.
  • Limits: this is clarity and safety-messaging QA, not a guarantee that every statement is exhaustive or that every binary you download is harmless.

Full methodology in the Imprint — The Imprint also states where AI is used and what that does—and does not—replace.

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .SM files

Use these platform-specific instructions to open .SM files safely.

Windows

  1. If the file is part of a song folder, keep the .sm alongside its audio and assets, then open that song in a StepMania-compatible game (e.g., StepMania) to play it.
  2. To view or edit the stepchart, open the .sm in ArrowVortex (it supports StepMania/ITG .sm).
  3. For quick inspection or troubleshooting, open the .sm with a plain-text editor to review tags and chart data.
Full Windows guide

Mac

  1. To play it, place the .sm in a song folder with its audio and assets and load the song in StepMania.
  2. To inspect the contents, open the .sm with a plain-text editor (the format is text-based).
  3. If you need editing tools not available on your Mac, move the song folder to a Windows PC and open it in ArrowVortex.
Full Mac guide

Linux

  1. To play it, put the .sm in a song folder with its audio and assets and load the song in StepMania on Linux.
  2. To inspect or make small fixes, open the .sm with a plain-text editor and correct obvious tag/path issues.
  3. If you specifically need ArrowVortex for editing, transfer the song folder to a Windows machine and edit there.
Full Linux guide

iOS

  1. There is no common native iOS 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.
Full iOS guide

Android

  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.
Full Android guide

Security notes

  • .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.
  • Treat downloaded song packs as untrusted bundles: the .sm references external media (audio/images/video) that will also be loaded by the engine, increasing the attack surface compared to opening a single text file.
  • Be cautious with unexpected files inside a “song pack” (especially executables or scripts); StepMania simfiles should primarily be charts and media assets rather than installers.

If you did not expect this file

This extension is usually plain data, text, or structured content—not a program by itself. The practical risk is social engineering (a scam attachment or misleading filename). For trusted senders you rarely need heavy-handed antivirus wording; use these tools when you want an extra check on unexpected downloads.

Avast

Avast offers free and premium antivirus software that protects against viruses, malware, ransomware, and phishing. Scan files before opening them to ensure safety.

Norton

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We may earn a commission when you use affiliate links. This supports our free file extension guides.

Can't open this file?

These are the most common causes and fixes when .SM files fail to open.

Common reasons

  • The .SM opens as garbled text or “unknown format” in a viewer
  • Song loads but has missing audio/backgrounds or errors
  • Charts don’t behave as expected (timing/notes) or advanced features are missing
  • Double-clicking doesn’t open the file in the right program

Fix steps

  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.

OS-specific troubleshooting

What is a .SM file?

.SM is a StepMania stepchart (simfile) format containing song information (tags/headers) and one or more note charts. The file is plain text and organized as tagged fields plus chart data. In the StepMania 5 ecosystem, .SM is supported but is largely superseded by .SSC for newer features.

Background

In practice, “.SM” most often means a StepMania stepchart file used with simfiles: the combination of a music file, optional background assets, and one or more charts that define the gameplay notes. The .SM file is the chart/metadata centerpiece that tells the game what the song is, where the audio starts, and what notes to spawn.

The format is human-readable text, so it can be inspected and sometimes repaired with a text editor. StepMania and StepMania-derived engines (including Project OutFox) support SM as a foundational format, although StepMania 5 introduced the .SSC format and considers it the more capable successor.

Beyond playing charts in StepMania-compatible games, .SM is widely used in the chart-authoring workflow. Editors can open it to create, time, and modify charts, then save back to .SM (or export to other simfile formats depending on the tool).

Common MIME types: application/vnd.stepmania.stepchart

Further reading

Authoritative resources for more details on the .SM format.

Common .SM 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.

FAQ

Is .SM a generic “data file”?

Most commonly, no—.SM refers to a StepMania simfile stepchart format used by rhythm-game engines and editors.

Can I open a .SM file in Notepad/TextEdit?

Yes. The StepMania .sm format is text-based, so you can inspect and sometimes fix tag/filename issues in a plain-text editor, but you need StepMania-compatible software to actually play or properly edit charts.

What’s the difference between .SM and .SSC?

Both are StepMania simfile formats; .SM is widely supported, but StepMania 5 largely superseded it with .SSC for newer capabilities while keeping .SM compatibility.

What MIME type is associated with StepMania stepcharts?

The IANA-registered vendor media type is application/vnd.stepmania.stepchart.

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