STG
application/octet-stream
Magic Bytes
Offset: 0
4D 49 4C 20
Standard Transaction Group (STG) is a legacy binary storage format developed by Bentley Systems for the MicroStation computer-aided design environment. It primarily serves as a repository for standard transaction groups, facilitating the organization and transfer of structured design data between CAD applications and spatial databases. As a proprietary historical format, it is now largely deprecated in favor of modern XML-based or DGN alternatives, though it remains categorized as safe due to its data-centric structure.
Validation Code
How to validate .stg files in Python
Python
def is_stg(file_path: str) -> bool:
"""Check if file is a valid STG by magic bytes."""
signature = bytes([0x4D, 0x49, 0x4C, 0x20])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .stg files in Node.js
Node.js
function isSTG(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x49, 0x4C, 0x20]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsSTG(data []byte) bool {
signature := []byte{0x4D, 0x49, 0x4C, 0x20}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/stg
curl https://filesignature.org/api/v1/stg