SMU (.smu)
.smu file signature | application/octet-stream
SMU is an IFF-based musical score file format developed for Electronic Arts and Amiga software as part of the Interchange File Format family. It was used to store and exchange simple music notation and composition data in compatible sequencing and multimedia applications. The format is legacy and is rarely encountered today, but it is generally considered safe because it stores structured score data rather than executable content.
Magic Bytes
Offset 0
46 4F 52 4D
Sources: Wikipedia
All Known Signatures
2 signature variants are documented for .smu files across multiple sources.
Extension
.smu
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .smu files in Python
def is_smu(file_path: str) -> bool:
"""Check if file is a valid SMU by magic bytes."""
signature = bytes([0x46, 0x4F, 0x52, 0x4D])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .smu files in Node.js
function isSMU(buffer: Buffer): boolean {
const signature = Buffer.from([0x46, 0x4F, 0x52, 0x4D]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .smu files in Go
func IsSMU(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/smu
curl https://filesignature.org/api/v1/smu
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .smu file?
A .smu file is identified by the magic bytes 46 4F 52 4D at byte offset 0. SMU is an IFF-based musical score file format developed for Electronic Arts and Amiga software as part of the Interchange File Format family. It was used to store and exchange simple music notation and composition data in compatible sequencing and multimedia applications. The format is legacy and is rarely encountered today, but it is generally considered safe because it stores structured score data rather than executable content.
What are the magic bytes for .smu files?
The magic bytes for SMU 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 .smu file?
To validate a .smu 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 .smu files?
There is no officially registered MIME type for .smu files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .smu files?
SMU (.smu) 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.