Quicken data file (.qdf)
.qdf file signature | application/octet-stream
Quicken data file
Magic Bytes
Offset 0
AC 9E BD 8F 00 00
Sources: Gary Kessler
Extension
.qdf
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .qdf files in Python
def is_qdf(file_path: str) -> bool:
"""Check if file is a valid QDF by magic bytes."""
signature = bytes([0xAC, 0x9E, 0xBD, 0x8F, 0x00, 0x00])
with open(file_path, "rb") as f:
return f.read(6) == signatureHow to validate .qdf files in Node.js
function isQDF(buffer: Buffer): boolean {
const signature = Buffer.from([0xAC, 0x9E, 0xBD, 0x8F, 0x00, 0x00]);
return buffer.subarray(0, 6).equals(signature);
}How to validate .qdf files in Go
func IsQDF(data []byte) bool {
signature := []byte{0xAC, 0x9E, 0xBD, 0x8F, 0x00, 0x00}
if len(data) < 6 {
return false
}
return bytes.Equal(data[:6], signature)
}API Endpoint
/api/v1/qdf
curl https://filesignature.org/api/v1/qdf
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .qdf file?
A .qdf file is a Quicken data file file. Quicken data file
What are the magic bytes for .qdf files?
The magic bytes for Quicken data file files are AC 9E BD 8F 00 00 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .qdf file?
To validate a .qdf file, read the first bytes of the file and compare them against the known magic bytes (AC 9E BD 8F 00 00) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .qdf files?
There is no officially registered MIME type for .qdf files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .qdf files?
Quicken data file (.qdf) 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.