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.BKM file extension

To open .BKM files on Windows, install and run BizHawk (from the official BizHawk project).

To open a .BKM file, use the BizHawk emulator on a desktop OS and load it as a movie/input recording. If the file won’t open, you may be using a newer workflow that expects .BK2 instead of the older .BKM 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 .BKM files

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

Windows

  1. Install and run BizHawk (from the official BizHawk project).
  2. In BizHawk, use the movie feature to open/play the movie file and select your .BKM file.
  3. If the movie won’t load, confirm you’re using a BizHawk setup that supports legacy .BKM, or obtain a .BK2 version of the movie if that’s what your workflow expects.
Full Windows guide

Mac

  1. Use BizHawk on macOS if available in your setup; otherwise transfer the .BKM to a Windows/Linux machine with BizHawk for playback.
  2. If you only need to inspect the file, open it in a plain-text editor (it is UTF-8 text).
Full Mac guide

Linux

  1. Install and run BizHawk (from the official BizHawk project).
  2. Use BizHawk’s movie playback/open feature to load the .BKM file.
  3. If playback fails, try a BizHawk version/workflow known to handle legacy .BKM, or use a .BK2 equivalent when available.
Full Linux guide

iOS

  1. iOS does not commonly support BizHawk movie playback; transfer the .BKM to a desktop system with BizHawk, or open it only for viewing in a text-capable app (UTF-8).
Full iOS guide

Android

  1. Android does not commonly support BizHawk movie playback; transfer the .BKM to a desktop system with BizHawk, or open it only for viewing in a text-capable app (UTF-8).
Full Android guide

Security notes

  • .BKM is a text-based format, not an executable, but treat it as untrusted input: opening it in an emulator still means parsing external data, which can expose you to bugs in the parser.
  • Prefer opening .BKM files with the official BizHawk builds from the BizHawk project, and avoid unknown “converter” utilities from untrusted sources.
  • If you only need to inspect contents, open .BKM in a plain-text editor (UTF-8) rather than running it through tools you don’t trust.

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

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Can't open this file?

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

Common reasons

  • The .BKM file won’t open or play back in BizHawk
  • The file opens as “garbled text” or with wrong characters
  • Accidental edits break the movie

Fix steps

  1. Verify the file is a BizHawk movie (.BKM) and not a different unrelated format using the same extension.
  2. Try loading the movie in BizHawk using the movie open/playback feature; if you’re using a setup that expects .BK2, obtain a .BK2 version or use a BizHawk configuration that supports legacy .BKM handling.
  3. Ensure you have the correct game/ROM and compatible emulator core settings expected by the movie.

OS-specific troubleshooting

What is a .BKM file?

A .BKM file is BizHawk’s original movie format for recording emulator input, documented as a UTF-8 text file with structured fields. It was obsoleted by BizHawk’s newer .BK2 movie format (the replacement format for later versions). Because it’s plain text, you can also inspect it in a text editor, but editing may break playback if the structure is altered.

Background

In the BizHawk emulator community, “movie” files capture controller inputs and related metadata so a run can be replayed deterministically. The .BKM format is BizHawk’s original movie format, documented as a UTF-8 text file with a defined structure and fields (e.g., header/metadata and input log lines).

This format became legacy when BizHawk introduced .BK2 as the newer movie format. As a result, you’ll still encounter .BKM files when working with older projects, legacy TAS submissions, or archives that predate the switch.

Practically, .BKM is most useful inside BizHawk for movie playback/editing workflows. Outside of BizHawk, the main “opening” experience is reading it as text to understand metadata or verify contents; it is not a general-purpose media/video file.

Common MIME types: application/vnd.nervana

Further reading

Authoritative resources for more details on the .BKM format.

Common .BKM issues

The .BKM file won’t open or play back in BizHawk

.BKM is a legacy movie format and may not be the expected format for your current BizHawk workflow (which uses .BK2 in newer versions). Playback can also fail if the movie depends on a specific core/game setup.

  1. Verify the file is a BizHawk movie (.BKM) and not a different unrelated format using the same extension.
  2. Try loading the movie in BizHawk using the movie open/playback feature; if you’re using a setup that expects .BK2, obtain a .BK2 version or use a BizHawk configuration that supports legacy .BKM handling.
  3. Ensure you have the correct game/ROM and compatible emulator core settings expected by the movie.

The file opens as “garbled text” or with wrong characters

The .BKM format is documented as UTF-8 text; opening it with the wrong encoding can make it look corrupted.

  1. Open the file in a text editor that lets you choose encoding and select UTF-8.
  2. Avoid saving the file in a different encoding if you plan to use it again in BizHawk.

Accidental edits break the movie

Because .BKM is structured text, small changes can invalidate expected fields or input log formatting and stop a movie from replaying correctly.

  1. Restore the original from a backup or re-download the file from its source.
  2. If you must edit, make a copy first and follow the documented field/log structure for .BKM.

FAQ

Is a .BKM file a video?

No. In the BizHawk context, .BKM is a “movie” meaning recorded controller inputs and metadata for deterministic replay in the emulator, not a rendered video.

Why do people mention .BK2 instead of .BKM?

BizHawk replaced the older .BKM movie format with the newer .BK2 format; .BKM is considered legacy/obsolete in later BizHawk versions.

Can I convert .BKM to .BK2 by renaming the extension?

No. Renaming doesn’t change the underlying format. If you need .BK2, use BizHawk’s movie workflow or a method documented by the BizHawk/TAS community for working with legacy movies.

What MIME type should I use for .BKM?

There is no .BKM-specific MIME type in the provided sources. The only referenced media type is IANA’s application/vnd.nervana, but the sources do not link it to .BKM specifically.

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