Skype localization data file (.mls)
.mls file signature | application/octet-stream
Skype localization data files are resource files used by Skype, originally developed by Skype Technologies and later maintained by Microsoft. They store translated interface text and regional language data used by the application at runtime. These files are generally safe to open, although they are typically part of legacy Skype installations and may be encountered in older client versions or localized software packages.
Magic Bytes
Offset 0
4D 49 4C 45 53
Sources: Gary Kessler
All Known Signatures
4 signature variants are documented for .mls files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 4D 49 4C 45 53 | 0 | Gary Kessler |
| 4D 4C 53 57 | 0 | Gary Kessler |
| 4D 56 32 31 34 | 0 | Gary Kessler |
| 4D 56 32 43 | 0 | Gary Kessler |
Extension
.mls
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .mls files in Python
def is_mls(file_path: str) -> bool:
"""Check if file is a valid MLS by magic bytes."""
signature = bytes([0x4D, 0x49, 0x4C, 0x45, 0x53])
with open(file_path, "rb") as f:
return f.read(5) == signatureHow to validate .mls files in Node.js
function isMLS(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x49, 0x4C, 0x45, 0x53]);
return buffer.subarray(0, 5).equals(signature);
}How to validate .mls files in Go
func IsMLS(data []byte) bool {
signature := []byte{0x4D, 0x49, 0x4C, 0x45, 0x53}
if len(data) < 5 {
return false
}
return bytes.Equal(data[:5], signature)
}API Endpoint
/api/v1/mls
curl https://filesignature.org/api/v1/mls
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .mls file?
A .mls file is a Skype localization data file file. Skype localization data files are resource files used by Skype, originally developed by Skype Technologies and later maintained by Microsoft. They store translated interface text and regional language data used by the application at runtime. These files are generally safe to open, although they are typically part of legacy Skype installations and may be encountered in older client versions or localized software packages.
What are the magic bytes for .mls files?
The magic bytes for Skype localization data file files are 4D 49 4C 45 53 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .mls file?
To validate a .mls file, read the first bytes of the file and compare them against the known magic bytes (4D 49 4C 45 53) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .mls files?
There is no officially registered MIME type for .mls files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .mls files?
Skype localization data file (.mls) 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.