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OBT (.obt)

.obt file signature | application/octet-stream

OBT is an object template file format used by PhotoCap, a photo editing application developed by NeoImagic Computing. It stores reusable graphic elements and templates for inserting decorations, captions, or layout components into photos and related projects on Windows during editing and batch processing. The format is generally safe, and it is primarily encountered in older PhotoCap workflows and archived project resources.

Safe

Magic Bytes

Offset 0
65 87 78 56

Sources: Wikipedia

Extension

.obt

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .obt files in Python

Python 
def is_obt(file_path: str) -> bool:
    """Check if file is a valid OBT by magic bytes."""
    signature = bytes([0x65, 0x87, 0x78, 0x56])
    with open(file_path, "rb") as f:
        return f.read(4) == signature

How to validate .obt files in Node.js

Node.js 
function isOBT(buffer: Buffer): boolean {
  const signature = Buffer.from([0x65, 0x87, 0x78, 0x56]);
  return buffer.subarray(0, 4).equals(signature);
}

How to validate .obt files in Go

Go 
func IsOBT(data []byte) bool {
    signature := []byte{0x65, 0x87, 0x78, 0x56}
    if len(data) < 4 {
        return false
    }
    return bytes.Equal(data[:4], signature)
}

API Endpoint

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

See the full API documentation for all endpoints and parameters.

Related Formats

.p25

Frequently Asked Questions

What is a .obt file?

A .obt file is identified by the magic bytes 65 87 78 56 at byte offset 0. OBT is an object template file format used by PhotoCap, a photo editing application developed by NeoImagic Computing. It stores reusable graphic elements and templates for inserting decorations, captions, or layout components into photos and related projects on Windows during editing and batch processing. The format is generally safe, and it is primarily encountered in older PhotoCap workflows and archived project resources.

What are the magic bytes for .obt files?

The magic bytes for OBT files are 65 87 78 56 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .obt file?

To validate a .obt file, read the first bytes of the file and compare them against the known magic bytes (65 87 78 56) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .obt files?

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

Is it safe to open .obt files?

OBT (.obt) 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.