OneNote Package file (.onepkg)
.onepkg file signature | application/octet-stream
Magic Bytes
Offset: 0
4D 53 43 46
OneNote Package file
Sources: Gary Kessler
Validation Code
How to validate .onepkg files in Python
def is_onepkg(file_path: str) -> bool:
"""Check if file is a valid ONEPKG by magic bytes."""
signature = bytes([0x4D, 0x53, 0x43, 0x46])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .onepkg files in Node.js
function isONEPKG(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x53, 0x43, 0x46]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .onepkg files in Go
func IsONEPKG(data []byte) bool {
signature := []byte{0x4D, 0x53, 0x43, 0x46}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/onepkg
curl https://filesignature.org/api/v1/onepkg
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .onepkg file?
A .onepkg file is a OneNote Package file file. OneNote Package file
What are the magic bytes for .onepkg files?
The magic bytes for OneNote Package file files are 4D 53 43 46 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .onepkg file?
To validate a .onepkg file, read the first bytes of the file and compare them against the known magic bytes (4D 53 43 46) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .onepkg files?
There is no officially registered MIME type for .onepkg files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .onepkg files?
OneNote Package file (.onepkg) 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.