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.ST file extension

To open .ST files on Windows, right-click the .ST file → Properties → note where it came from (download/source folder, related files, size).

To open a .ST file, first identify where it came from (the creating app or project). Then open it from inside the relevant application (or use “Open with…” on desktop) because .ST is not a single universal format.

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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 .ST files

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

Windows

  1. Right-click the .ST file → Properties → note where it came from (download/source folder, related files, size).
  2. Right-click → Open with… → choose the program that created it (or a compatible program from the same workflow, e.g., tracker/music software if it came from a music project).
  3. If no app is listed or it fails, open the suspected creating application first and use its File → Open/Import menu to load the .ST file.
Full Windows guide

Mac

  1. Control-click the .ST file → Get Info → check “Open with” to see if macOS suggests an app; if not, that’s common for ambiguous extensions.
  2. Control-click → Open With → pick the correct creating/compatible app (often determined by the file’s origin, such as a music/tracker workflow).
  3. If it still won’t open, try opening from inside the relevant app using File → Open/Import.
Full Mac guide

Linux

  1. Right-click the .ST file in your file manager → Properties → look for a detected file type/MIME; note that shared-mime-info mappings may not uniquely identify .ST.
  2. Right-click → Open With → select the application that created the file (or a compatible one for that workflow).
  3. If your desktop doesn’t recognize it, try opening the file from within the suspected creating application via its Open/Import command.
Full Linux guide

iOS

  1. In the Files app, tap the .ST file; if it won’t preview, use Share → “Open in…” and choose an app specifically related to the file’s origin (otherwise transfer the file to a desktop system to identify it).
Full iOS guide

Android

  1. Open the file from your file manager; if no app can open it, use Share/Open with to try a relevant app tied to the file’s source, or transfer it to a desktop to determine the correct format.
Full Android guide

Security notes

  • .ST is not a single standardized format; do not rely on the extension alone to determine safety or content type.
  • Be cautious with unknown .ST files from the internet: ambiguous extensions can be used to disguise unexpected content, and buggy parsers in specialized applications can still be exploited by malformed data files.
  • Prefer opening unknown .ST files in the application that created them (or in a well-known, up-to-date tool for that file’s specific domain) rather than trying random viewers.
  • If the file came with a project folder, keep related files together; missing dependencies can cause errors that look like corruption.

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

Norton 360 delivers comprehensive antivirus protection, VPN, and identity theft monitoring. Scan files for threats before opening to keep your device secure.

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 .ST files fail to open.

Common reasons

  • No app can open the .ST file
  • The file opens in the wrong program
  • Error or corrupted/invalid file message
  • Linux desktop does not recognize the file type

Fix steps

  1. Identify the file’s origin (which app/project produced it) and install that application or a compatible one for the same workflow.
  2. Try opening the file from inside the application using File → Open/Import rather than double-clicking.
  3. If you received the file without context, ask the sender what program created it.

OS-specific troubleshooting

What is a .ST file?

.ST is a generic extension used by different applications for different data. Some systems and MIME mapping lists associate .st with the vendor media type application/vnd.sailingtracker.track, but many .ST files in the wild belong to other, non-standardized formats (notably music/tracker-related). Because there is no single standard, file origin and content determine the correct software.

Background

The .ST extension is best treated as a “container label” rather than one well-defined format: multiple software ecosystems have used “.st” for their own saved data. File-extension reference sites explicitly list multiple associations for .ST and warn that you may need context (what app produced it, what project it belongs to) to open it reliably.

On some platforms, MIME mapping lists associate .st with the vendor media type application/vnd.sailingtracker.track. MIME mappings help operating systems suggest an app, but they do not guarantee the file is actually that type—especially for a short, widely reused extension like .st.

If you do not know the source application, the most practical next step is to inspect the file properties (size, any accompanying project files) and try opening it with applications that match the likely use case noted by extension references (for example, music/tracker-related tools when the file came from an audio/mod-tracker context).

Common MIME types: application/vnd.sailingtracker.track

Further reading

Authoritative resources for more details on the .ST format.

Common .ST issues

No app can open the .ST file

This often happens because .ST is used by multiple formats, and your system cannot determine which application should handle this particular file.

  1. Identify the file’s origin (which app/project produced it) and install that application or a compatible one for the same workflow.
  2. Try opening the file from inside the application using File → Open/Import rather than double-clicking.
  3. If you received the file without context, ask the sender what program created it.

The file opens in the wrong program

Because .ST is ambiguous, your OS may associate it with an unrelated app or MIME mapping.

  1. Use “Open with…” (Windows/macOS/Linux) and select the correct application for this specific .ST file.
  2. Change the default association only if most of your .ST files come from the same source application.

Error or corrupted/invalid file message

The file may be incomplete, not actually the expected .ST subtype, or created by a different version/tool than the one you are using.

  1. Re-download or re-copy the file (avoid email clients or messaging apps that may truncate attachments).
  2. Confirm you are using software meant for that .ST subtype (for example, tracker/music-related tools for tracker-related .ST files).
  3. Ask for the file to be re-exported or saved in a more common format from the source application.

Linux desktop does not recognize the file type

Not all .ST uses have official shared-mime-info definitions, and the same extension can map to multiple meanings.

  1. Try “Open With” and manually select the likely application based on the file’s origin.
  2. If a MIME mapping is misleading, treat it as a hint only and verify by opening in the creating app.

FAQ

What program opens a .ST file?

There isn’t one universal program: .ST is used by multiple, unrelated formats. The correct program is usually the one that created the file (often hinted by where you got it—e.g., a music/tracker project vs. a tracking/telemetry app).

Is .ST the same as SailingTracker track files?

Some MIME mapping lists associate .st with the vendor media type application/vnd.sailingtracker.track, but .ST is also used for other formats. The extension alone is not enough to confirm the file’s actual type.

Can I convert a file to .ST by renaming it?

No. Renaming only changes the extension label. Use the source application’s export/save-as feature (or a proper converter for the specific .ST subtype).

Why won’t my phone open a .ST file?

Mobile OSes often lack specialized software for ambiguous desktop-oriented formats. If no compatible app is available, transfer the file to a desktop to identify the correct program or ask the sender for a more common export format.

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