MUS (.mus)
.mus file signature | application/vnd.musician
MUS is a simple musical score file format associated with the Interchange File Format family, originally defined for early multimedia software and maintained as a legacy format in archival tools. It was used to store compact sequence data for playback, editing, and integration in games, demo programs, and other music applications. Because it is a legacy format, support is limited today, but the files are generally low risk when handled by standard audio or viewer software.
Magic Bytes
Offset 0
46 4F 52 4D
Sources: Wikipedia
All Known Signatures
3 signature variants are documented for .mus files across multiple sources.
Extension
.mus
MIME Type
application/vnd.musician
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .mus files in Python
def is_mus(file_path: str) -> bool:
"""Check if file is a valid MUS by magic bytes."""
signature = bytes([0x46, 0x4F, 0x52, 0x4D])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .mus files in Node.js
function isMUS(buffer: Buffer): boolean {
const signature = Buffer.from([0x46, 0x4F, 0x52, 0x4D]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .mus files in Go
func IsMUS(data []byte) bool {
signature := []byte{0x46, 0x4F, 0x52, 0x4D}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/mus
curl https://filesignature.org/api/v1/mus
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .mus file?
A .mus file is identified by the magic bytes 46 4F 52 4D at byte offset 0. MUS is a simple musical score file format associated with the Interchange File Format family, originally defined for early multimedia software and maintained as a legacy format in archival tools. It was used to store compact sequence data for playback, editing, and integration in games, demo programs, and other music applications. Because it is a legacy format, support is limited today, but the files are generally low risk when handled by standard audio or viewer software.
What are the magic bytes for .mus files?
The magic bytes for MUS files are 46 4F 52 4D at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .mus file?
To validate a .mus file, read the first bytes of the file and compare them against the known magic bytes (46 4F 52 4D) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .mus files?
The primary MIME type for .mus files is application/vnd.musician.
Is it safe to open .mus files?
MUS (.mus) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.