Skip to content

Unicode extensions (.uce)

.uce file signature | application/octet-stream

Unicode extensions (UCE) is a file format associated with Unicode data and maintained by the Unicode Consortium. It is used by software and localization tools to store extended character, collation, or language support data for text processing. The format is generally safe, and files are typically small data resources rather than executable content; it has no notable legacy status today.

Safe

Magic Bytes

Offset 0
55 43 45 58

Sources: Gary Kessler

Extension

.uce

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .uce files in Python

Python 
def is_uce(file_path: str) -> bool:
    """Check if file is a valid UCE by magic bytes."""
    signature = bytes([0x55, 0x43, 0x45, 0x58])
    with open(file_path, "rb") as f:
        return f.read(4) == signature

How to validate .uce files in Node.js

Node.js 
function isUCE(buffer: Buffer): boolean {
  const signature = Buffer.from([0x55, 0x43, 0x45, 0x58]);
  return buffer.subarray(0, 4).equals(signature);
}

How to validate .uce files in Go

Go 
func IsUCE(data []byte) bool {
    signature := []byte{0x55, 0x43, 0x45, 0x58}
    if len(data) < 4 {
        return false
    }
    return bytes.Equal(data[:4], signature)
}

API Endpoint

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

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .uce file?

A .uce file is a Unicode extensions file. Unicode extensions (UCE) is a file format associated with Unicode data and maintained by the Unicode Consortium. It is used by software and localization tools to store extended character, collation, or language support data for text processing. The format is generally safe, and files are typically small data resources rather than executable content; it has no notable legacy status today.

What are the magic bytes for .uce files?

The magic bytes for Unicode extensions files are 55 43 45 58 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .uce file?

To validate a .uce file, read the first bytes of the file and compare them against the known magic bytes (55 43 45 58) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .uce files?

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

Is it safe to open .uce files?

Unicode extensions (.uce) 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.