Audio compression formatdeveloped by Skype; also used by other applications (.sil)
.sil file signature | application/octet-stream
SIL is an audio compression format developed by Skype for efficient speech encoding and decoding. It is used primarily for voice communication in VoIP systems, including Skype and other applications that support the codec. The format is generally considered safe to handle, though support may depend on older or proprietary software implementations and compatibility layers. Historically, it was associated with Skype's early telephony stack.
Magic Bytes
Offset 0
23 21 53 49 4C 4B 0A
Sources: Wikipedia, Gary Kessler
Extension
.sil
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .sil files in Python
def is_sil(file_path: str) -> bool:
"""Check if file is a valid SIL by magic bytes."""
signature = bytes([0x23, 0x21, 0x53, 0x49, 0x4C, 0x4B, 0x0A])
with open(file_path, "rb") as f:
return f.read(7) == signatureHow to validate .sil files in Node.js
function isSIL(buffer: Buffer): boolean {
const signature = Buffer.from([0x23, 0x21, 0x53, 0x49, 0x4C, 0x4B, 0x0A]);
return buffer.subarray(0, 7).equals(signature);
}How to validate .sil files in Go
func IsSIL(data []byte) bool {
signature := []byte{0x23, 0x21, 0x53, 0x49, 0x4C, 0x4B, 0x0A}
if len(data) < 7 {
return false
}
return bytes.Equal(data[:7], signature)
}API Endpoint
/api/v1/sil
curl https://filesignature.org/api/v1/sil
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .sil file?
A .sil file is a Audio compression formatdeveloped by Skype; also used by other applications file. SIL is an audio compression format developed by Skype for efficient speech encoding and decoding. It is used primarily for voice communication in VoIP systems, including Skype and other applications that support the codec. The format is generally considered safe to handle, though support may depend on older or proprietary software implementations and compatibility layers. Historically, it was associated with Skype's early telephony stack.
What are the magic bytes for .sil files?
The magic bytes for Audio compression formatdeveloped by Skype; also used by other applications files are 23 21 53 49 4C 4B 0A at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .sil file?
To validate a .sil file, read the first bytes of the file and compare them against the known magic bytes (23 21 53 49 4C 4B 0A) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .sil files?
There is no officially registered MIME type for .sil files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .sil files?
Audio compression formatdeveloped by Skype; also used by other applications (.sil) 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.