Windows Event Viewer file (.evt)
.evt file signature | application/octet-stream
Windows Event Viewer file (EVT) is a proprietary event log format developed and maintained by Microsoft for use in Microsoft Windows. It stores system, security, and application event records and was used by Windows Event Viewer and related administrative tools to review logs and troubleshoot system behavior. The format is associated with older Windows versions and has largely been replaced by newer event log formats; files are generally safe, though logs may contain sensitive operational information.
Magic Bytes
Offset 0
4C 66 4C 65
Sources: Wikipedia
All Known Signatures
2 signature variants are documented for .evt files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 4C 66 4C 65 | 0 | Wikipedia |
| 30 00 00 00 4C 66 4C 65 | 0 | Gary Kessler |
Extension
.evt
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .evt files in Python
def is_evt(file_path: str) -> bool:
"""Check if file is a valid EVT by magic bytes."""
signature = bytes([0x4C, 0x66, 0x4C, 0x65])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .evt files in Node.js
function isEVT(buffer: Buffer): boolean {
const signature = Buffer.from([0x4C, 0x66, 0x4C, 0x65]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .evt files in Go
func IsEVT(data []byte) bool {
signature := []byte{0x4C, 0x66, 0x4C, 0x65}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/evt
curl https://filesignature.org/api/v1/evt
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .evt file?
A .evt file is a Windows Event Viewer file file. Windows Event Viewer file (EVT) is a proprietary event log format developed and maintained by Microsoft for use in Microsoft Windows. It stores system, security, and application event records and was used by Windows Event Viewer and related administrative tools to review logs and troubleshoot system behavior. The format is associated with older Windows versions and has largely been replaced by newer event log formats; files are generally safe, though logs may contain sensitive operational information.
What are the magic bytes for .evt files?
The magic bytes for Windows Event Viewer file files are 4C 66 4C 65 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .evt file?
To validate a .evt file, read the first bytes of the file and compare them against the known magic bytes (4C 66 4C 65) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .evt files?
There is no officially registered MIME type for .evt files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .evt files?
Windows Event Viewer file (.evt) 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.