Sprint Music Store audio file (.koz)

.koz file signature | application/octet-stream

Sprint Music Store audio file (for mobile devices)

Safe

Magic Bytes

Offset 0


              49 44 33 03 00 00 00

Sources: Gary Kessler

Extension

.koz

MIME Type

application/octet-stream

Byte Offset

Risk Level

Safe

Validation Code

How to validate .koz files in Python

Python

def is_koz(file_path: str) -> bool:
    """Check if file is a valid KOZ by magic bytes."""
    signature = bytes([0x49, 0x44, 0x33, 0x03, 0x00, 0x00, 0x00])
    with open(file_path, "rb") as f:
        return f.read(7) == signature

How to validate .koz files in Node.js

Node.js

function isKOZ(buffer: Buffer): boolean {
  const signature = Buffer.from([0x49, 0x44, 0x33, 0x03, 0x00, 0x00, 0x00]);
  return buffer.subarray(0, 7).equals(signature);
}

How to validate .koz files in Go

func IsKOZ(data []byte) bool {
    signature := []byte{0x49, 0x44, 0x33, 0x03, 0x00, 0x00, 0x00}
    if len(data) < 7 {
        return false
    }
    return bytes.Equal(data[:7], signature)
}

API Endpoint

GET /api/v1/koz


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

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .koz file?

A .koz file is a Sprint Music Store audio file file. Sprint Music Store audio file (for mobile devices)

What are the magic bytes for .koz files?

The magic bytes for Sprint Music Store audio file files are 49 44 33 03 00 00 00 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .koz file?

To validate a .koz file, read the first bytes of the file and compare them against the known magic bytes (49 44 33 03 00 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 .koz files?

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

Is it safe to open .koz files?

Sprint Music Store audio file (.koz) 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.