AIN Compressed Archive
application/octet-stream
Magic Bytes
Offset: 0
21 3C 61 72 63 68 3E 0A
AIN Compressed Archive is a legacy file compression format developed by George Trifonov for the MS-DOS operating system. It was primarily used to package multiple files into a single compressed volume to optimize storage space and facilitate distribution through early bulletin board systems. Although now obsolete and rarely supported by contemporary software, the format remains a low security risk because it lacks internal scripting capabilities or executable triggers.
Validation Code
How to validate .ain files in Python
Python
def is_ain(file_path: str) -> bool:
"""Check if file is a valid AIN by magic bytes."""
signature = bytes([0x21, 0x3C, 0x61, 0x72, 0x63, 0x68, 0x3E, 0x0A])
with open(file_path, "rb") as f:
return f.read(8) == signatureHow to validate .ain files in Node.js
Node.js
function isAIN(buffer: Buffer): boolean {
const signature = Buffer.from([0x21, 0x3C, 0x61, 0x72, 0x63, 0x68, 0x3E, 0x0A]);
return buffer.subarray(0, 8).equals(signature);
}
Go
func IsAIN(data []byte) bool {
signature := []byte{0x21, 0x3C, 0x61, 0x72, 0x63, 0x68, 0x3E, 0x0A}
if len(data) < 8 {
return false
}
return bytes.Equal(data[:8], signature)
}API Endpoint
GET
/api/v1/ain
curl https://filesignature.org/api/v1/ain