Quark Express document (.qxd)
.qxd file signature | application/octet-stream
Quark Express document (Intel & Motorola, respectively)NOTE:It appears that the byte following the 0x52 ("R") isthe language indicator; 0x33 ("3") seems to indicate Englishand 0x61 ("a") reportedly indicates Korean.
Magic Bytes
Offset 0
00 00 49 49 58 50 52 00 00 4D 4D 58 50 52
Sources: Wikipedia
All Known Signatures
4 signature variants are documented for .qxd files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 00 00 49 49 58 50 52 00 00 4D 4D 58 50 52 | 0 | Wikipedia |
| 00 00 1A 00 05 10 04 | 0 | Gary Kessler |
| 00 00 49 49 58 50 52 | 0 | Gary Kessler |
| 00 00 4D 4D 58 50 52 | 0 | Gary Kessler |
Extension
.qxd
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .qxd files in Python
def is_qxd(file_path: str) -> bool:
"""Check if file is a valid QXD by magic bytes."""
signature = bytes([0x00, 0x00, 0x49, 0x49, 0x58, 0x50, 0x52, 0x00, 0x00, 0x4D, 0x4D, 0x58, 0x50, 0x52])
with open(file_path, "rb") as f:
return f.read(14) == signatureHow to validate .qxd files in Node.js
function isQXD(buffer: Buffer): boolean {
const signature = Buffer.from([0x00, 0x00, 0x49, 0x49, 0x58, 0x50, 0x52, 0x00, 0x00, 0x4D, 0x4D, 0x58, 0x50, 0x52]);
return buffer.subarray(0, 14).equals(signature);
}How to validate .qxd files in Go
func IsQXD(data []byte) bool {
signature := []byte{0x00, 0x00, 0x49, 0x49, 0x58, 0x50, 0x52, 0x00, 0x00, 0x4D, 0x4D, 0x58, 0x50, 0x52}
if len(data) < 14 {
return false
}
return bytes.Equal(data[:14], signature)
}API Endpoint
/api/v1/qxd
curl https://filesignature.org/api/v1/qxd
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .qxd file?
A .qxd file is a Quark Express document file. Quark Express document (Intel & Motorola, respectively)NOTE:It appears that the byte following the 0x52 ("R") isthe language indicator; 0x33 ("3") seems to indicate Englishand 0x61 ("a") reportedly indicates Korean.
What are the magic bytes for .qxd files?
The magic bytes for Quark Express document files are 00 00 49 49 58 50 52 00 00 4D 4D 58 50 52 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .qxd file?
To validate a .qxd file, read the first bytes of the file and compare them against the known magic bytes (00 00 49 49 58 50 52 00 00 4D 4D 58 50 52) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .qxd files?
There is no officially registered MIME type for .qxd files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .qxd files?
Quark Express document (.qxd) 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.