MSIX (.msix)
.msix file signature | application/msix
MSIX is a Windows application packaging format developed and maintained by Microsoft for distributing software and application components. It is used to install, update, and remove desktop, UWP, and other Windows applications in a standardized package. MSIX packages are typically signed and can be checked for integrity, but files from untrusted sources should still be verified before installation.
Magic Bytes
Offset 0
50 4B 03 04
Sources: Wikipedia
All Known Signatures
3 signature variants are documented for .msix files across multiple sources.
Extension
.msix
MIME Type
application/msix
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .msix files in Python
def is_msix(file_path: str) -> bool:
"""Check if file is a valid MSIX by magic bytes."""
signature = bytes([0x50, 0x4B, 0x03, 0x04])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .msix files in Node.js
function isMSIX(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .msix files in Go
func IsMSIX(data []byte) bool {
signature := []byte{0x50, 0x4B, 0x03, 0x04}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/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 identified by the magic bytes 50 4B 03 04 at byte offset 0. MSIX is a Windows application packaging format developed and maintained by Microsoft for distributing software and application components. It is used to install, update, and remove desktop, UWP, and other Windows applications in a standardized package. MSIX packages are typically signed and can be checked for integrity, but files from untrusted sources should still be verified before installation.
What are the magic bytes for .msix files?
The magic bytes for MSIX files are 50 4B 03 04 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) 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?
The primary MIME type for .msix files is application/msix.
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.