OLE object library (.olb)
.olb file signature | application/octet-stream
Magic Bytes
Offset: 0
4D 5A
OLE object library
Sources: Gary Kessler
Validation Code
How to validate .olb files in Python
def is_olb(file_path: str) -> bool:
"""Check if file is a valid OLB by magic bytes."""
signature = bytes([0x4D, 0x5A])
with open(file_path, "rb") as f:
return f.read(2) == signatureHow to validate .olb files in Node.js
function isOLB(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x5A]);
return buffer.subarray(0, 2).equals(signature);
}How to validate .olb files in Go
func IsOLB(data []byte) bool {
signature := []byte{0x4D, 0x5A}
if len(data) < 2 {
return false
}
return bytes.Equal(data[:2], signature)
}API Endpoint
/api/v1/olb
curl https://filesignature.org/api/v1/olb
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .olb file?
A .olb file is a OLE object library file. OLE object library
What are the magic bytes for .olb files?
The magic bytes for OLE object library files are 4D 5A at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .olb file?
To validate a .olb file, read the first bytes of the file and compare them against the known magic bytes (4D 5A) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .olb files?
There is no officially registered MIME type for .olb files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .olb files?
OLE object library (.olb) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.