Compressed archive file
application/octet-stream
Magic Bytes
Offset: 0
4B 50 4B 41
The Compressed Archive File (PAK) is a specialized container format developed by various software authors to aggregate multiple data streams into a single uncompressed or compressed volume. It is predominantly used in legacy video games and early application installers to organize textures, audio, and configuration scripts for streamlined distribution. Although largely succeeded by modern archive standards, the format is considered safe, provided that antivirus software scans the uncompressed contents for potentially malicious executable code.
Validation Code
How to validate .pak files in Python
Python
def is_pak(file_path: str) -> bool:
"""Check if file is a valid PAK by magic bytes."""
signature = bytes([0x4B, 0x50, 0x4B, 0x41])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .pak files in Node.js
Node.js
function isPAK(buffer: Buffer): boolean {
const signature = Buffer.from([0x4B, 0x50, 0x4B, 0x41]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsPAK(data []byte) bool {
signature := []byte{0x4B, 0x50, 0x4B, 0x41}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/pak
curl https://filesignature.org/api/v1/pak