RS (.rs)
.rs file signature | application/x-dosexec
The RS file format is the MS-DOS executable application format, originally created by Microsoft for DOS and later maintained through the Windows executable family. It is used to launch programs, installers, and other executable utilities on compatible systems. This is a legacy format with historical importance, and executable files should be treated cautiously because they can contain malicious code when obtained from untrusted sources.
Magic Bytes
Offset 0
4D 5A
Sources: Wikipedia
All Known Signatures
2 signature variants are documented for .rs files across multiple sources.
Extension
.rs
MIME Type
application/x-dosexec
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .rs files in Python
def is_rs(file_path: str) -> bool:
"""Check if file is a valid RS by magic bytes."""
signature = bytes([0x4D, 0x5A])
with open(file_path, "rb") as f:
return f.read(2) == signatureHow to validate .rs files in Node.js
function isRS(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x5A]);
return buffer.subarray(0, 2).equals(signature);
}How to validate .rs files in Go
func IsRS(data []byte) bool {
signature := []byte{0x4D, 0x5A}
if len(data) < 2 {
return false
}
return bytes.Equal(data[:2], signature)
}API Endpoint
/api/v1/rs
curl https://filesignature.org/api/v1/rs
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .rs file?
A .rs file is identified by the magic bytes 4D 5A at byte offset 0. The RS file format is the MS-DOS executable application format, originally created by Microsoft for DOS and later maintained through the Windows executable family. It is used to launch programs, installers, and other executable utilities on compatible systems. This is a legacy format with historical importance, and executable files should be treated cautiously because they can contain malicious code when obtained from untrusted sources.
What are the magic bytes for .rs files?
The magic bytes for RS 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 .rs file?
To validate a .rs 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 .rs files?
The primary MIME type for .rs files is application/x-dosexec.
Is it safe to open .rs files?
RS (.rs) 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.