OpenOffice spreadsheet (.sxi)
.sxi file signature | application/octet-stream
Magic Bytes
Offset: 0
50 4B 03 04
OpenOffice spreadsheet (Calc), drawing (Draw), presentation (Impress),and word processing (Writer) files, respectively.
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.
Frequently Asked Questions
What is a .sxi file?
A .sxi file is a OpenOffice spreadsheet file. OpenOffice spreadsheet (Calc), drawing (Draw), presentation (Impress),and word processing (Writer) files, respectively.
What are the magic bytes for .sxi files?
The magic bytes for OpenOffice spreadsheet files are 50 4B 03 04 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
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?
There is no officially registered MIME type for .sxi files. Systems typically use application/octet-stream as a generic fallback when handling this format.
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.