Quicken QuickFinder Information File (.idx)
.idx file signature | application/octet-stream
AOL database files: address book (ABY) and user configurationdata (MAIN.IDX)
Magic Bytes
Offset 0
49 4E 44 58
Sources: Wikipedia
All Known Signatures
3 signature variants are documented for .idx files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 49 4E 44 58 | 0 | Wikipedia |
| 41 4F 4C 44 42 | 0 | Gary Kessler |
| 50 00 00 00 20 00 00 00 | 0 | Gary Kessler |
Extension
.idx
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .idx files in Python
def is_idx(file_path: str) -> bool:
"""Check if file is a valid IDX by magic bytes."""
signature = bytes([0x49, 0x4E, 0x44, 0x58])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .idx files in Node.js
function isIDX(buffer: Buffer): boolean {
const signature = Buffer.from([0x49, 0x4E, 0x44, 0x58]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .idx files in Go
func IsIDX(data []byte) bool {
signature := []byte{0x49, 0x4E, 0x44, 0x58}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/idx
curl https://filesignature.org/api/v1/idx
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .idx file?
A .idx file is a Quicken QuickFinder Information File file. AOL database files: address book (ABY) and user configurationdata (MAIN.IDX)
What are the magic bytes for .idx files?
The magic bytes for Quicken QuickFinder Information File files are 49 4E 44 58 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .idx file?
To validate a .idx file, read the first bytes of the file and compare them against the known magic bytes (49 4E 44 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 .idx files?
There is no officially registered MIME type for .idx files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .idx files?
Quicken QuickFinder Information File (.idx) 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.