Yamaha Corp (.mmf)

.mmf file signature | application/octet-stream

Yamaha Corp. Synthetic music Mobile Application Format (SMAF)for multimedia files that can be played on hand-held devices.

Safe

Magic Bytes

Offset 0


              4D 4D 4D 44 00 00

Sources: Gary Kessler

Extension

.mmf

MIME Type

application/octet-stream

Byte Offset

Risk Level

Safe

Validation Code

How to validate .mmf files in Python

Python

def is_mmf(file_path: str) -> bool:
    """Check if file is a valid MMF by magic bytes."""
    signature = bytes([0x4D, 0x4D, 0x4D, 0x44, 0x00, 0x00])
    with open(file_path, "rb") as f:
        return f.read(6) == signature

How to validate .mmf files in Node.js

Node.js

function isMMF(buffer: Buffer): boolean {
  const signature = Buffer.from([0x4D, 0x4D, 0x4D, 0x44, 0x00, 0x00]);
  return buffer.subarray(0, 6).equals(signature);
}

How to validate .mmf files in Go

func IsMMF(data []byte) bool {
    signature := []byte{0x4D, 0x4D, 0x4D, 0x44, 0x00, 0x00}
    if len(data) < 6 {
        return false
    }
    return bytes.Equal(data[:6], signature)
}

API Endpoint

GET /api/v1/mmf


              curl https://filesignature.org/api/v1/mmf

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .mmf file?

A .mmf file is a Yamaha Corp file. Yamaha Corp. Synthetic music Mobile Application Format (SMAF)for multimedia files that can be played on hand-held devices.

What are the magic bytes for .mmf files?

The magic bytes for Yamaha Corp files are 4D 4D 4D 44 00 00 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .mmf file?

To validate a .mmf file, read the first bytes of the file and compare them against the known magic bytes (4D 4D 4D 44 00 00) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .mmf files?

There is no officially registered MIME type for .mmf files. Systems typically use application/octet-stream as a generic fallback when handling this format.

Is it safe to open .mmf files?

Yamaha Corp (.mmf) 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.