XPCOM type libraries for the XPIDL compiler (.xpt)

.xpt file signature | application/octet-stream

XPCOM type libraries for the XPIDL compiler

Safe

Magic Bytes

Offset 0


              48 45 41 44 45 52 20 52 45 43 4F 52 44 2A 2A 2A

Sources: Gary Kessler

All Known Signatures

3 signature variants are documented for .xpt files across multiple sources.

Hex Signature	Offset	Sources
48 45 41 44 45 52 20 52 45 43 4F 52 44 2A 2A 2A	0	Gary Kessler
50 4B 03 04	0	Gary Kessler
58 50 43 4F 4D 0A 54 79 70 65 4C 69 62	0	Gary Kessler

Extension

.xpt

MIME Type

application/octet-stream

Byte Offset

Risk Level

Safe

Validation Code

How to validate .xpt files in Python

Python

def is_xpt(file_path: str) -> bool:
    """Check if file is a valid XPT by magic bytes."""
    signature = bytes([0x48, 0x45, 0x41, 0x44, 0x45, 0x52, 0x20, 0x52, 0x45, 0x43, 0x4F, 0x52, 0x44, 0x2A, 0x2A, 0x2A])
    with open(file_path, "rb") as f:
        return f.read(16) == signature

How to validate .xpt files in Node.js

Node.js

function isXPT(buffer: Buffer): boolean {
  const signature = Buffer.from([0x48, 0x45, 0x41, 0x44, 0x45, 0x52, 0x20, 0x52, 0x45, 0x43, 0x4F, 0x52, 0x44, 0x2A, 0x2A, 0x2A]);
  return buffer.subarray(0, 16).equals(signature);
}

How to validate .xpt files in Go

func IsXPT(data []byte) bool {
    signature := []byte{0x48, 0x45, 0x41, 0x44, 0x45, 0x52, 0x20, 0x52, 0x45, 0x43, 0x4F, 0x52, 0x44, 0x2A, 0x2A, 0x2A}
    if len(data) < 16 {
        return false
    }
    return bytes.Equal(data[:16], signature)
}

API Endpoint

GET /api/v1/xpt


              curl https://filesignature.org/api/v1/xpt

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .xpt file?

A .xpt file is a XPCOM type libraries for the XPIDL compiler file. XPCOM type libraries for the XPIDL compiler

What are the magic bytes for .xpt files?

The magic bytes for XPCOM type libraries for the XPIDL compiler files are 48 45 41 44 45 52 20 52 45 43 4F 52 44 2A 2A 2A at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .xpt file?

To validate a .xpt file, read the first bytes of the file and compare them against the known magic bytes (48 45 41 44 45 52 20 52 45 43 4F 52 44 2A 2A 2A) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .xpt files?

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

Is it safe to open .xpt files?

XPCOM type libraries for the XPIDL compiler (.xpt) 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.