Skip to content

SPSS output file magic bytes (.spo)

.spo file signature: D0 CF 11 E0 A1 B1 1A E1 | application/octet-stream

SPSS output file (SPO) is a report file format used by IBM SPSS Statistics, maintained by IBM, for storing analysis results and presentation output. It is used to preserve tables, charts, syntax output, and other results from statistical workflows for review, sharing, and later editing within SPSS. The format is generally safe, though like other legacy Office-style compound document files it should be opened only from trusted sources.

Safe

Magic Bytes

Offset 0
D0 CF 11 E0 A1 B1 1A E1

Sources: Gary Kessler

Extension

.spo

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .spo files in Python

Python 
def is_spo(file_path: str) -> bool:
    """Check if file is a valid SPO by magic bytes."""
    signature = bytes([0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1])
    with open(file_path, "rb") as f:
        return f.read(8) == signature

How to validate .spo files in Node.js

Node.js 
function isSPO(buffer: Buffer): boolean {
  const signature = Buffer.from([0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1]);
  return buffer.subarray(0, 8).equals(signature);
}

How to validate .spo files in Go

Go 
func IsSPO(data []byte) bool {
    signature := []byte{0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1}
    if len(data) < 8 {
        return false
    }
    return bytes.Equal(data[:8], signature)
}

API Endpoint

GET /api/v1/spo
curl https://filesignature.org/api/v1/spo

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .spo file?

A .spo file is an SPSS output file. SPSS output file (SPO) is a report file format used by IBM SPSS Statistics, maintained by IBM, for storing analysis results and presentation output. It is used to preserve tables, charts, syntax output, and other results from statistical workflows for review, sharing, and later editing within SPSS. The format is generally safe, though like other legacy Office-style compound document files it should be opened only from trusted sources.

What are the magic bytes for .spo files?

The magic bytes for SPSS output file (.spo) files are D0 CF 11 E0 A1 B1 1A E1 at byte offset 0. These bytes identify the file format more reliably than the extension alone.

How do I validate a .spo file?

To validate a .spo file, read the first bytes of the file and compare them against the known magic bytes (D0 CF 11 E0 A1 B1 1A E1) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .spo files?

There is no officially registered MIME type for .spo files. Systems typically use application/octet-stream as a generic fallback when handling this format.

Is it safe to open .spo files?

SPSS output file (.spo) 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.