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MSIX (.msix)

.msix file signature | application/octet-stream

zip file formatand formats based on it, such asEPUB,JAR,ODF,OOXML

Safe

Magic Bytes

Offset 0
50 4B 03 04 50 4B 05 06 50 4B 07 08

Sources: Wikipedia

Extension

.msix

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .msix files in Python

Python 
def is_msix(file_path: str) -> bool:
    """Check if file is a valid MSIX by magic bytes."""
    signature = bytes([0x50, 0x4B, 0x03, 0x04, 0x50, 0x4B, 0x05, 0x06, 0x50, 0x4B, 0x07, 0x08])
    with open(file_path, "rb") as f:
        return f.read(12) == signature

How to validate .msix files in Node.js

Node.js 
function isMSIX(buffer: Buffer): boolean {
  const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04, 0x50, 0x4B, 0x05, 0x06, 0x50, 0x4B, 0x07, 0x08]);
  return buffer.subarray(0, 12).equals(signature);
}

How to validate .msix files in Go

Go 
func IsMSIX(data []byte) bool {
    signature := []byte{0x50, 0x4B, 0x03, 0x04, 0x50, 0x4B, 0x05, 0x06, 0x50, 0x4B, 0x07, 0x08}
    if len(data) < 12 {
        return false
    }
    return bytes.Equal(data[:12], signature)
}

API Endpoint

GET /api/v1/msix
curl https://filesignature.org/api/v1/msix

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .msix file?

A .msix file is a MSIX file. zip file formatand formats based on it, such asEPUB,JAR,ODF,OOXML

What are the magic bytes for .msix files?

The magic bytes for MSIX files are 50 4B 03 04 50 4B 05 06 50 4B 07 08 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .msix file?

To validate a .msix file, read the first bytes of the file and compare them against the known magic bytes (50 4B 03 04 50 4B 05 06 50 4B 07 08) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .msix files?

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

Is it safe to open .msix files?

MSIX (.msix) 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.