Microsoft Windows Media Audio/Video File (.wma)
.wma file signature | audio/x-ms-wma
Microsoft Windows Media Audio/Video (WMA) is a media file format developed by Microsoft as part of the Windows Media platform and based on the Advanced Systems Format container. It is used for storing compressed audio and, in some cases, audio-video content for playback in Windows Media Player and compatible media applications. The format is largely legacy, though it remains safe to open in trusted players and may appear in older media collections.
Magic Bytes
Offset 0
30 26 B2 75 8E 66 CF 11
Sources: Wikipedia
All Known Signatures
3 signature variants are documented for .wma files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 30 26 B2 75 8E 66 CF 11 | 0 | Wikipedia |
| A6 D9 00 AA 00 62 CE 6C | 0 | Wikipedia |
| 30 26 B2 75 8E 66 CF 11 A6 D9 00 AA 00 62 CE 6C | 0 | Gary Kessler |
Extension
.wma
MIME Type
audio/x-ms-wma
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .wma files in Python
def is_wma(file_path: str) -> bool:
"""Check if file is a valid WMA by magic bytes."""
signature = bytes([0x30, 0x26, 0xB2, 0x75, 0x8E, 0x66, 0xCF, 0x11])
with open(file_path, "rb") as f:
return f.read(8) == signatureHow to validate .wma files in Node.js
function isWMA(buffer: Buffer): boolean {
const signature = Buffer.from([0x30, 0x26, 0xB2, 0x75, 0x8E, 0x66, 0xCF, 0x11]);
return buffer.subarray(0, 8).equals(signature);
}How to validate .wma files in Go
func IsWMA(data []byte) bool {
signature := []byte{0x30, 0x26, 0xB2, 0x75, 0x8E, 0x66, 0xCF, 0x11}
if len(data) < 8 {
return false
}
return bytes.Equal(data[:8], signature)
}API Endpoint
/api/v1/wma
curl https://filesignature.org/api/v1/wma
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .wma file?
A .wma file is a Microsoft Windows Media Audio/Video File file. Microsoft Windows Media Audio/Video (WMA) is a media file format developed by Microsoft as part of the Windows Media platform and based on the Advanced Systems Format container. It is used for storing compressed audio and, in some cases, audio-video content for playback in Windows Media Player and compatible media applications. The format is largely legacy, though it remains safe to open in trusted players and may appear in older media collections.
What are the magic bytes for .wma files?
The magic bytes for Microsoft Windows Media Audio/Video File files are 30 26 B2 75 8E 66 CF 11 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .wma file?
To validate a .wma file, read the first bytes of the file and compare them against the known magic bytes (30 26 B2 75 8E 66 CF 11) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .wma files?
The primary MIME type for .wma files is audio/x-ms-wma.
Is it safe to open .wma files?
Microsoft Windows Media Audio/Video File (.wma) 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.