What is the MUS file format?
.mus is a music notation format used by Finale and other applications developed by MakeMusic. The file contains only musical notation data without actual audio. .mus was Finale's native format until replaced by the .musx format starting with Finale 2014.
Although .mus files resemble .mid files in purpose, the data is not stored in MIDI format - .mus uses a closed, undocumented MakeMusic binary structure containing additional engraving detail (dynamics, articulations, page layout) used only by Finale.
MakeMusic discontinued Finale in September 2024, making .mus a fully legacy format. Migration to MusicXML via a legacy Finale installation is the recommended path to current notation software.
Security & safety
RISK: LOWA .mus is a passive notation document with no executable code, so opening one is safe. The real 'risk' is preservation, not malware: because the format is proprietary and Finale is discontinued (support ended August 2025) with no other app able to read .mus/.musx, scores can become effectively unreadable. Anyone with Finale still installed should export their .mus/.musx files to MusicXML now while authorization works. Avoid sketchy 'free .mus converter' or cracked-Finale download sites - there's no legitimate standalone .mus converter.
Format details
in a nutshellFULL NAMEFinale Notation File (legacy)
DEVELOPERMakeMusicsince 1988 (Finale 1.0); .mus was Finale's native format until replaced by .musx in Finale 2014
CATEGORYAudio Files
MIME TYPEapplication/octet-stream
TYPEmusic notation (sheet music) document, not audio - proprietary binary
This extension is also used by…
- Halo / other game music & resource files - Some games (e.g. older Halo PC) and engines use .mus for packaged music/audio resource data - unrelated to Finale notation.
- Doom / sound-driver MUS music - The id Software MUS format (DMX) stores MIDI-like game music in Doom-era WADs; a few of these appear as standalone .mus files.
Programs that open MUS files
Windows3 apps
Finale (legacy, if still installed/authorized)
Paid If you have a working Finale: open the .mus, then File → Export → MusicXML to migrate. Finale was discontinued (2024) and support ended Aug 2025 - back up exports now.
MuseScore (via MusicXML)
Open-source Free notation app. It can't open .mus directly - first export the file to MusicXML from Finale, then open the .musicxml/.mxl in MuseScore.
Dorico (MakeMusic-endorsed successor)
Paid Steinberg's notation app and the official Finale crossgrade target. Import via MusicXML exported from Finale; Dorico cannot read .mus/.musx natively. 
macOS3 apps
Finale (legacy, if still installed/authorized)
Paid Open the .mus and export to MusicXML for migration. Discontinued 2024 - do this while authorization still works.
MuseScore (via MusicXML)
Open-source Free; import the MusicXML you exported from Finale (it can't open .mus directly). Technical details
deep spec| Format type | Proprietary binary music notation document; stores sheet-music engraving data, not audio or MIDI |
| Developer | MakeMusic (formerly Coda Music Technology) |
| Native application | Finale (discontinued by MakeMusic in September 2024) |
| Successor format | .musx - a ZIP-based container introduced with Finale 2014 |
| MIME type | application/octet-stream (no IANA-registered MIME type specific to .mus) |
| Magic bytes | No documented stable magic-byte signature; files identified by extension and Finale's internal parser |
| Binary structure | Closed, undocumented proprietary binary; structure was never publicly specified by MakeMusic |
| Stored content | Notes, rhythms, clefs, key and time signatures, dynamics, articulations, slurs, lyrics, and page-layout metadata |
| Audio content | None - .mus is a notation/engraving file with no audio stream |
| MIDI relationship | Not MIDI-based; internal binary is entirely MakeMusic-proprietary despite carrying musical data |
| Platform | Windows and macOS (legacy Finale versions only; no native support in currently maintained software) |
| Finale version range | Natively produced by Finale 1.0 through Finale 2012; legacy read support in Finale 2014-2025 |
| Migration path | Open in an authorized legacy Finale installation, export to MusicXML, import into Dorico or MuseScore |
| Current status | Fully legacy; no active tooling development; dependent on legacy Finale installations remaining authorized |
| Released | 1988 (Finale 1.0); .mus was Finale's native format until replaced by .musx in Finale 2014 |
| Specification | www.finalemusic.com |
MUS conversions
Possible
.MUS .MUSICXMLGUIDE
Yes - open the .mus in Finale and use File > Export > MusicXML; that is the only reliable method.
How to convert
.MUS .MP3GUIDE
Yes, conversion is possible - the fastest route is Finale's built-in File > Export > Audio, which renders the…
How to convert
.MUS .PDFGUIDE
Yes -- open the file in Finale and print or export to PDF. Without Finale, export to MusicXML first and then…
How to convert
.MUS .MIDGUIDE
Yes, you can convert MUS to MID, but only if you have Finale installed - use File > Export > MIDI.
How to convert
.MUS .MUSXGUIDE
Yes -- if you have Finale installed, open the .mus file and use File > Save As to write it as .musx in under…
How to convert
Community Q&A
asked by usersNo questions yet - be the first to ask about MUS files.
Frequently asked questions
How do I open a .mus file?
A .mus is a Finale notation file. If you have Finale (even a legacy install), open it there. If not, there's no other program that reads .mus directly - you'll need someone with Finale to export it to MusicXML, which MuseScore (free), Dorico or Sibelius can then open.
How do I open a .mus file without Finale?
You can't open it directly - the format is proprietary and undocumented, and Finale was discontinued in 2024. The only reliable route is to get the file exported to MusicXML from a working Finale, then open that in MuseScore (free), Dorico or Sibelius.
Is Finale really discontinued?
Yes. MakeMusic announced the end of Finale's development and sales on 26 August 2024, and technical support ended 26 August 2025. They endorse migrating to Steinberg's Dorico and shipped Finale v27 to help users export to MusicXML.
Can MuseScore open Finale .mus files?
Not directly. MuseScore can't read the proprietary .mus/.musx format. You must first export the score to MusicXML from Finale; MuseScore then imports that MusicXML.
How do I convert a .mus to PDF?
Open the file in Finale and Print to PDF (or Export PDF). Without Finale, export the score to MusicXML, open it in MuseScore, and export the PDF from there.
Is a .mus file audio?
No - despite being categorized as 'audio', a Finale .mus is sheet music (notation), not a recording. Finale can render playback to MP3/WAV on export, but the file itself stores the written score.
What's the difference between .mus and .musx?
.mus is Finale's older native format (through Finale 2012); .musx is the newer format from Finale 2014 onward. Both are Finale-only; export to MusicXML to use them elsewhere.
References
1Scoring Notes - MakeMusic ends development and availability of Finale (Aug 2024)www.scoringnotes.com
2MakeMusic - Finale Sunset FAQmakemusic.zendesk.com
