Resource Interchange File Format --Windows MusicalInstrument Digital Interface file (.rmi)
.rmi file signature | audio/midi
Resource Interchange File Format MIDI (RMI) is a RIFF-based audio file format developed by Microsoft and IBM for storing Standard MIDI data in a structured container. It is used to exchange and play MIDI sequences in software instruments, sequencers, and multimedia applications. The format is largely historical and generally safe, although playback depends on the host synthesizer rather than embedded audio content.
Magic Bytes
Offset 0
4D 54 68 64
Sources: Apache Tika
All Known Signatures
2 signature variants are documented for .rmi files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 4D 54 68 64 | 0 | Apache Tika |
| 52 49 46 46 52 4D 49 44 64 61 74 61 | 0 | Gary Kessler |
Extension
.rmi
MIME Type
audio/midi
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .rmi files in Python
def is_rmi(file_path: str) -> bool:
"""Check if file is a valid RMI by magic bytes."""
signature = bytes([0x4D, 0x54, 0x68, 0x64])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .rmi files in Node.js
function isRMI(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x54, 0x68, 0x64]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .rmi files in Go
func IsRMI(data []byte) bool {
signature := []byte{0x4D, 0x54, 0x68, 0x64}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/rmi
curl https://filesignature.org/api/v1/rmi
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .rmi file?
A .rmi file is a Resource Interchange File Format --Windows MusicalInstrument Digital Interface file file. Resource Interchange File Format MIDI (RMI) is a RIFF-based audio file format developed by Microsoft and IBM for storing Standard MIDI data in a structured container. It is used to exchange and play MIDI sequences in software instruments, sequencers, and multimedia applications. The format is largely historical and generally safe, although playback depends on the host synthesizer rather than embedded audio content.
What are the magic bytes for .rmi files?
The magic bytes for Resource Interchange File Format --Windows MusicalInstrument Digital Interface file files are 4D 54 68 64 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .rmi file?
To validate a .rmi file, read the first bytes of the file and compare them against the known magic bytes (4D 54 68 64) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .rmi files?
The primary MIME type for .rmi files is audio/midi.
Is it safe to open .rmi files?
Resource Interchange File Format --Windows MusicalInstrument Digital Interface file (.rmi) 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.