AOL HTML mail file (.dci)
.dci file signature | application/octet-stream
AOL HTML mail file
Magic Bytes
Offset 0
3C 21 64 6F 63 74 79 70
Sources: Gary Kessler
Extension
.dci
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .dci files in Python
def is_dci(file_path: str) -> bool:
"""Check if file is a valid DCI by magic bytes."""
signature = bytes([0x3C, 0x21, 0x64, 0x6F, 0x63, 0x74, 0x79, 0x70])
with open(file_path, "rb") as f:
return f.read(8) == signatureHow to validate .dci files in Node.js
function isDCI(buffer: Buffer): boolean {
const signature = Buffer.from([0x3C, 0x21, 0x64, 0x6F, 0x63, 0x74, 0x79, 0x70]);
return buffer.subarray(0, 8).equals(signature);
}How to validate .dci files in Go
func IsDCI(data []byte) bool {
signature := []byte{0x3C, 0x21, 0x64, 0x6F, 0x63, 0x74, 0x79, 0x70}
if len(data) < 8 {
return false
}
return bytes.Equal(data[:8], signature)
}API Endpoint
/api/v1/dci
curl https://filesignature.org/api/v1/dci
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .dci file?
A .dci file is a AOL HTML mail file file. AOL HTML mail file
What are the magic bytes for .dci files?
The magic bytes for AOL HTML mail file files are 3C 21 64 6F 63 74 79 70 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .dci file?
To validate a .dci file, read the first bytes of the file and compare them against the known magic bytes (3C 21 64 6F 63 74 79 70) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .dci files?
There is no officially registered MIME type for .dci files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .dci files?
AOL HTML mail file (.dci) 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.