MSIX
application/octet-stream
Magic Bytes
Offset: 0
50 4B 03 04 50 4B 05 06 50 4B 07 08
MSIX is a Windows application packaging format developed by Microsoft that combines features of standard MSI installers and App-V virtualization. It serves as the primary container for distributing and deploying modern desktop applications, ensuring compatibility across various Windows architectures and delivery channels. Because the format utilizes ZIP-based compression to encapsulate files within a lightweight container, it isolates software from the host operating system to prevent registry clutter and maintain system stability.
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) == signatureHow 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);
}
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