Microsoft Open XML paper specification file magic bytes (.oxps)
.oxps file signature: 50 4B 03 04 | application/oxps
Category: Documents
Open XML Paper Specification (OXPS) is a page description and document package format developed by Microsoft and standardized by Ecma International and ISO/IEC. It is used for fixed-layout documents such as reports, forms, and print-ready files, and can be opened by Microsoft Windows, Microsoft Office, and compatible viewers. The format is generally considered safe, though, like other document containers, files from untrusted sources should still be handled with care.
Magic Bytes
Offset 0
50 4B 03 04
Sources: Gary Kessler
Validation Code
How to validate .oxps files in Python
def is_oxps(file_path: str) -> bool:
"""Check if file is a valid OXPS by magic bytes."""
signature = bytes([0x50, 0x4B, 0x03, 0x04])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .oxps files in Node.js
function isOXPS(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .oxps files in Go
func IsOXPS(data []byte) bool {
signature := []byte{0x50, 0x4B, 0x03, 0x04}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/oxps
curl https://filesignature.org/api/v1/oxps
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .oxps file?
A .oxps file is a Microsoft Open XML paper specification file. Open XML Paper Specification (OXPS) is a page description and document package format developed by Microsoft and standardized by Ecma International and ISO/IEC. It is used for fixed-layout documents such as reports, forms, and print-ready files, and can be opened by Microsoft Windows, Microsoft Office, and compatible viewers. The format is generally considered safe, though, like other document containers, files from untrusted sources should still be handled with care.
What are the magic bytes for .oxps files?
The magic bytes for Microsoft Open XML paper specification file (.oxps) files are 50 4B 03 04 at byte offset 0. These bytes identify the file format more reliably than the extension alone.
How do I validate a .oxps file?
To validate a .oxps file, read the first bytes of the file and compare them against the known magic bytes (50 4B 03 04) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .oxps files?
The primary MIME type for .oxps files is application/oxps.
Is it safe to open .oxps files?
Microsoft Open XML paper specification file (.oxps) 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.