MS Exchange 2007 extended configuration file
application/octet-stream
Magic Bytes
Offset: 0
5B 4D 53 56 43
The Microsoft Exchange 2007 extended configuration file is a proprietary settings format developed by Microsoft for use within its enterprise messaging ecosystem. This format stores configuration data for client-side extensions and add-ins in Outlook, facilitating customized server-side behaviors and specialized email management workflows. As Microsoft Exchange Server 2007 has reached its end-of-life, these files are considered legacy and are largely superseded by more modern XML-based configuration standards in newer software versions.
Validation Code
How to validate .ecf files in Python
Python
def is_ecf(file_path: str) -> bool:
"""Check if file is a valid ECF by magic bytes."""
signature = bytes([0x5B, 0x4D, 0x53, 0x56, 0x43])
with open(file_path, "rb") as f:
return f.read(5) == signatureHow to validate .ecf files in Node.js
Node.js
function isECF(buffer: Buffer): boolean {
const signature = Buffer.from([0x5B, 0x4D, 0x53, 0x56, 0x43]);
return buffer.subarray(0, 5).equals(signature);
}
Go
func IsECF(data []byte) bool {
signature := []byte{0x5B, 0x4D, 0x53, 0x56, 0x43}
if len(data) < 5 {
return false
}
return bytes.Equal(data[:5], signature)
}API Endpoint
GET
/api/v1/ecf
curl https://filesignature.org/api/v1/ecf