CNT (.cnt)
.cnt file signature | application/octet-stream
Windows 3.x - Windows 95 Help Contents
Magic Bytes
Offset 0
3A 42 61 73 65 20
Sources: Wikipedia
Extension
.cnt
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .cnt files in Python
def is_cnt(file_path: str) -> bool:
"""Check if file is a valid CNT by magic bytes."""
signature = bytes([0x3A, 0x42, 0x61, 0x73, 0x65, 0x20])
with open(file_path, "rb") as f:
return f.read(6) == signatureHow to validate .cnt files in Node.js
function isCNT(buffer: Buffer): boolean {
const signature = Buffer.from([0x3A, 0x42, 0x61, 0x73, 0x65, 0x20]);
return buffer.subarray(0, 6).equals(signature);
}How to validate .cnt files in Go
func IsCNT(data []byte) bool {
signature := []byte{0x3A, 0x42, 0x61, 0x73, 0x65, 0x20}
if len(data) < 6 {
return false
}
return bytes.Equal(data[:6], signature)
}API Endpoint
/api/v1/cnt
curl https://filesignature.org/api/v1/cnt
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .cnt file?
A .cnt file is a CNT file. Windows 3.x - Windows 95 Help Contents
What are the magic bytes for .cnt files?
The magic bytes for CNT files are 3A 42 61 73 65 20 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .cnt file?
To validate a .cnt file, read the first bytes of the file and compare them against the known magic bytes (3A 42 61 73 65 20) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .cnt files?
There is no officially registered MIME type for .cnt files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .cnt files?
CNT (.cnt) 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.