PRT (.prt)
.prt file signature | application/x-prt
PRT is a proprietary part-model file format used by PTC’s Creo Parametric, formerly Pro/ENGINEER, for storing three-dimensional mechanical design data. It is used to create and edit individual parts in computer-aided design workflows, including engineering documentation, simulation, and manufacturing preparation. The format is generally safe, but as with other CAD files, it should be opened in trusted software because malformed or very large models can affect application stability.
Magic Bytes
Offset 8
30 4D 33 43
Sources: Apache Tika
Extension
.prt
MIME Type
application/x-prt
Byte Offset
8
Risk Level
Safe
Validation Code
How to validate .prt files in Python
def is_prt(file_path: str) -> bool:
"""Check if file is a valid PRT by magic bytes at offset 8."""
signature = bytes([0x30, 0x4D, 0x33, 0x43])
with open(file_path, "rb") as f:
f.seek(8)
return f.read(4) == signatureHow to validate .prt files in Node.js
function isPRT(buffer: Buffer): boolean {
const signature = Buffer.from([0x30, 0x4D, 0x33, 0x43]);
if (buffer.length < 12) return false;
return buffer.subarray(8, 12).equals(signature);
}How to validate .prt files in Go
func IsPRT(data []byte) bool {
signature := []byte{0x30, 0x4D, 0x33, 0x43}
if len(data) < 12 {
return false
}
return bytes.Equal(data[8:12], signature)
}API Endpoint
/api/v1/prt
curl https://filesignature.org/api/v1/prt
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .prt file?
A .prt file is identified by the magic bytes 30 4D 33 43 at byte offset 8. PRT is a proprietary part-model file format used by PTC’s Creo Parametric, formerly Pro/ENGINEER, for storing three-dimensional mechanical design data. It is used to create and edit individual parts in computer-aided design workflows, including engineering documentation, simulation, and manufacturing preparation. The format is generally safe, but as with other CAD files, it should be opened in trusted software because malformed or very large models can affect application stability.
What are the magic bytes for .prt files?
The magic bytes for PRT files are 30 4D 33 43 at byte offset 8. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .prt file?
To validate a .prt file, read the first bytes of the file and compare them against the known magic bytes (30 4D 33 43) at offset 8. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .prt files?
The primary MIME type for .prt files is application/x-prt.
Is it safe to open .prt files?
PRT (.prt) 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.