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DesignTools 2D Design file (.dtd)

.dtd file signature | application/octet-stream

DesignTools 2D Design file

Safe

Magic Bytes

Offset 0
07 64 74 32 64 64 74 64

Sources: Wikipedia, Gary Kessler

Extension

.dtd

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .dtd files in Python

Python 
def is_dtd(file_path: str) -> bool:
    """Check if file is a valid DTD by magic bytes."""
    signature = bytes([0x07, 0x64, 0x74, 0x32, 0x64, 0x64, 0x74, 0x64])
    with open(file_path, "rb") as f:
        return f.read(8) == signature

How to validate .dtd files in Node.js

Node.js 
function isDTD(buffer: Buffer): boolean {
  const signature = Buffer.from([0x07, 0x64, 0x74, 0x32, 0x64, 0x64, 0x74, 0x64]);
  return buffer.subarray(0, 8).equals(signature);
}

How to validate .dtd files in Go

Go 
func IsDTD(data []byte) bool {
    signature := []byte{0x07, 0x64, 0x74, 0x32, 0x64, 0x64, 0x74, 0x64}
    if len(data) < 8 {
        return false
    }
    return bytes.Equal(data[:8], signature)
}

API Endpoint

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

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .dtd file?

A .dtd file is a DesignTools 2D Design file file. DesignTools 2D Design file

What are the magic bytes for .dtd files?

The magic bytes for DesignTools 2D Design file files are 07 64 74 32 64 64 74 64 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .dtd file?

To validate a .dtd file, read the first bytes of the file and compare them against the known magic bytes (07 64 74 32 64 64 74 64) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .dtd files?

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

Is it safe to open .dtd files?

DesignTools 2D Design file (.dtd) 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.