Quatro Pro for Windows 7
application/octet-stream
Magic Bytes
Offset: 0
3F 5F 03 00
Quattro Pro for Windows 7 (WB3) is a proprietary spreadsheet file format developed by Borland and later maintained by Corel Corporation. These files store financial data, formulas, and charts within the Quattro Pro software suite, which historically competed with Microsoft Excel. Although now considered a legacy format, it remains compatible with modern versions of the WordPerfect Office suite for archival data retrieval and is generally considered low-risk.
Validation Code
How to validate .wb3 files in Python
Python
def is_wb3(file_path: str) -> bool:
"""Check if file is a valid WB3 by magic bytes."""
signature = bytes([0x3F, 0x5F, 0x03, 0x00])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .wb3 files in Node.js
Node.js
function isWB3(buffer: Buffer): boolean {
const signature = Buffer.from([0x3F, 0x5F, 0x03, 0x00]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsWB3(data []byte) bool {
signature := []byte{0x3F, 0x5F, 0x03, 0x00}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/wb3
curl https://filesignature.org/api/v1/wb3