MS audio compression manager driver (.acm)
.acm file signature | application/octet-stream
Magic Bytes
Offset: 0
4D 5A
MS audio compression manager driver
Sources: Gary Kessler
Validation Code
How to validate .acm files in Python
def is_acm(file_path: str) -> bool:
"""Check if file is a valid ACM by magic bytes."""
signature = bytes([0x4D, 0x5A])
with open(file_path, "rb") as f:
return f.read(2) == signatureHow to validate .acm files in Node.js
function isACM(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x5A]);
return buffer.subarray(0, 2).equals(signature);
}How to validate .acm files in Go
func IsACM(data []byte) bool {
signature := []byte{0x4D, 0x5A}
if len(data) < 2 {
return false
}
return bytes.Equal(data[:2], signature)
}API Endpoint
/api/v1/acm
curl https://filesignature.org/api/v1/acm
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .acm file?
A .acm file is a MS audio compression manager driver file. MS audio compression manager driver
What are the magic bytes for .acm files?
The magic bytes for MS audio compression manager driver files are 4D 5A at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .acm file?
To validate a .acm file, read the first bytes of the file and compare them against the known magic bytes (4D 5A) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .acm files?
There is no officially registered MIME type for .acm files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .acm files?
MS audio compression manager driver (.acm) 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.