D64 (.d64)
.d64 file signature | application/octet-stream
Commodore 641541 disk image (D64 format)
Magic Bytes
Offset 0
A0 32 41 A0 A0 A0
Sources: Wikipedia
Extension
.d64
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .d64 files in Python
def is_d64(file_path: str) -> bool:
"""Check if file is a valid D64 by magic bytes."""
signature = bytes([0xA0, 0x32, 0x41, 0xA0, 0xA0, 0xA0])
with open(file_path, "rb") as f:
return f.read(6) == signatureHow to validate .d64 files in Node.js
function isD64(buffer: Buffer): boolean {
const signature = Buffer.from([0xA0, 0x32, 0x41, 0xA0, 0xA0, 0xA0]);
return buffer.subarray(0, 6).equals(signature);
}How to validate .d64 files in Go
func IsD64(data []byte) bool {
signature := []byte{0xA0, 0x32, 0x41, 0xA0, 0xA0, 0xA0}
if len(data) < 6 {
return false
}
return bytes.Equal(data[:6], signature)
}API Endpoint
/api/v1/d64
curl https://filesignature.org/api/v1/d64
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .d64 file?
A .d64 file is a D64 file. Commodore 641541 disk image (D64 format)
What are the magic bytes for .d64 files?
The magic bytes for D64 files are A0 32 41 A0 A0 A0 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .d64 file?
To validate a .d64 file, read the first bytes of the file and compare them against the known magic bytes (A0 32 41 A0 A0 A0) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .d64 files?
There is no officially registered MIME type for .d64 files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .d64 files?
D64 (.d64) 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.