Corel Presentation Exchange magic bytes (.cmx)
.cmx file signature: 52 49 46 46 | image/x-cmx
Category: Images
Corel Presentation Exchange (CMX) is a vector-graphics interchange format developed by Corel for exchanging illustration data between Corel applications and other software. It is used for storing drawings, clip art, and technical illustrations, and was commonly supported by CorelDRAW and related desktop publishing tools. CMX is a legacy format, and while it is generally safe to open, older files may not render consistently in modern viewers.
Magic Bytes
Offset 0
52 49 46 46
Sources: Gary Kessler
Validation Code
How to validate .cmx files in Python
def is_cmx(file_path: str) -> bool:
"""Check if file is a valid CMX by magic bytes."""
signature = bytes([0x52, 0x49, 0x46, 0x46])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .cmx files in Node.js
function isCMX(buffer: Buffer): boolean {
const signature = Buffer.from([0x52, 0x49, 0x46, 0x46]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .cmx files in Go
func IsCMX(data []byte) bool {
signature := []byte{0x52, 0x49, 0x46, 0x46}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/cmx
curl https://filesignature.org/api/v1/cmx
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .cmx file?
A .cmx file is a Corel Presentation Exchange file. Corel Presentation Exchange (CMX) is a vector-graphics interchange format developed by Corel for exchanging illustration data between Corel applications and other software. It is used for storing drawings, clip art, and technical illustrations, and was commonly supported by CorelDRAW and related desktop publishing tools. CMX is a legacy format, and while it is generally safe to open, older files may not render consistently in modern viewers.
What are the magic bytes for .cmx files?
The magic bytes for Corel Presentation Exchange (.cmx) files are 52 49 46 46 at byte offset 0. These bytes identify the file format more reliably than the extension alone.
How do I validate a .cmx file?
To validate a .cmx file, read the first bytes of the file and compare them against the known magic bytes (52 49 46 46) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .cmx files?
The primary MIME type for .cmx files is image/x-cmx.
Is it safe to open .cmx files?
Corel Presentation Exchange (.cmx) 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.