XLEX
text/plain
Magic Bytes
Offset: 0
54 68 69 73 20 69 73 20 54 65 58 2C
XLEX is a proprietary file format used by Xerox within their document processing and typesetting ecosystems, particularly for handling TeX-based text layouts. It primarily serves as a container for specialized typesetting instructions and font metrics used in legacy document management systems and early electronic publishing workflows. As a legacy format, it is now largely obsolete and replaced by modern typesetting standards, though its plain text structure ensures it remains low-risk and resistant to malicious code execution.
Validation Code
How to validate .xlex files in Python
Python
def is_xlex(file_path: str) -> bool:
"""Check if file is a valid XLEX by magic bytes."""
signature = bytes([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C])
with open(file_path, "rb") as f:
return f.read(12) == signatureHow to validate .xlex files in Node.js
Node.js
function isXLEX(buffer: Buffer): boolean {
const signature = Buffer.from([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C]);
return buffer.subarray(0, 12).equals(signature);
}
Go
func IsXLEX(data []byte) bool {
signature := []byte{0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C}
if len(data) < 12 {
return false
}
return bytes.Equal(data[:12], signature)
}API Endpoint
GET
/api/v1/xlex
curl https://filesignature.org/api/v1/xlex