OpenOffice spreadsheet magic bytes (.sxi)
.sxi file signature: 50 4B 03 04 | application/vnd.sun.xml.impress
OpenOffice Impress is a presentation file format originally created by Sun Microsystems and later maintained within the OpenOffice and LibreOffice ecosystems. It was used for slide decks, lecture materials, business presentations, and other multimedia presentations in OpenOffice Impress. The format is a legacy predecessor to newer OpenDocument-based files, and documents from untrusted sources should still be opened with standard caution, although the format is generally considered safe.
Magic Bytes
Offset 0
50 4B 03 04
Sources: Gary Kessler
Validation Code
How to validate .sxi files in Python
def is_sxi(file_path: str) -> bool:
"""Check if file is a valid SXI by magic bytes."""
signature = bytes([0x50, 0x4B, 0x03, 0x04])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .sxi files in Node.js
function isSXI(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .sxi files in Go
func IsSXI(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/sxi
curl https://filesignature.org/api/v1/sxi
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .sxi file?
A .sxi file is an OpenOffice spreadsheet. OpenOffice Impress is a presentation file format originally created by Sun Microsystems and later maintained within the OpenOffice and LibreOffice ecosystems. It was used for slide decks, lecture materials, business presentations, and other multimedia presentations in OpenOffice Impress. The format is a legacy predecessor to newer OpenDocument-based files, and documents from untrusted sources should still be opened with standard caution, although the format is generally considered safe.
What are the magic bytes for .sxi files?
The magic bytes for OpenOffice spreadsheet (.sxi) 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 .sxi file?
To validate a .sxi 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 .sxi files?
The primary MIME type for .sxi files is application/vnd.sun.xml.impress.
Is it safe to open .sxi files?
OpenOffice spreadsheet (.sxi) 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.