Quatro Pro for Windows 7 (.wb3)

.wb3 file signature | application/x-quattro-pro

Quattro Pro for Windows 7 Notebook (WB3) is a spreadsheet file format developed by Borland and later maintained by Corel for the Quattro Pro application. It was used to store worksheets, formulas, charts, and related spreadsheet data in Quattro Pro for Windows 7 and compatible later versions. The format is now largely legacy and may require compatibility software to open, but it is generally considered safe when handled with standard office-document precautions.

Safe

Magic Bytes

Offset 24


              3E 00 03 00 FE FF 09 00 06

Sources: Gary Kessler

Extension

.wb3

MIME Type

application/x-quattro-pro

Byte Offset

Risk Level

Safe

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 at offset 24."""
    signature = bytes([0x3E, 0x00, 0x03, 0x00, 0xFE, 0xFF, 0x09, 0x00, 0x06])
    with open(file_path, "rb") as f:
        f.seek(24)
        return f.read(9) == signature

How to validate .wb3 files in Node.js

Node.js

function isWB3(buffer: Buffer): boolean {
  const signature = Buffer.from([0x3E, 0x00, 0x03, 0x00, 0xFE, 0xFF, 0x09, 0x00, 0x06]);
  if (buffer.length < 33) return false;
  return buffer.subarray(24, 33).equals(signature);
}

How to validate .wb3 files in Go

func IsWB3(data []byte) bool {
    signature := []byte{0x3E, 0x00, 0x03, 0x00, 0xFE, 0xFF, 0x09, 0x00, 0x06}
    if len(data) < 33 {
        return false
    }
    return bytes.Equal(data[24:33], signature)
}

API Endpoint

GET /api/v1/wb3


              curl https://filesignature.org/api/v1/wb3

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .wb3 file?

A .wb3 file is a Quatro Pro for Windows 7 file. Quattro Pro for Windows 7 Notebook (WB3) is a spreadsheet file format developed by Borland and later maintained by Corel for the Quattro Pro application. It was used to store worksheets, formulas, charts, and related spreadsheet data in Quattro Pro for Windows 7 and compatible later versions. The format is now largely legacy and may require compatibility software to open, but it is generally considered safe when handled with standard office-document precautions.

What are the magic bytes for .wb3 files?

The magic bytes for Quatro Pro for Windows 7 files are 3E 00 03 00 FE FF 09 00 06 at byte offset 24. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .wb3 file?

To validate a .wb3 file, read the first bytes of the file and compare them against the known magic bytes (3E 00 03 00 FE FF 09 00 06) at offset 24. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .wb3 files?

The primary MIME type for .wb3 files is application/x-quattro-pro.

Is it safe to open .wb3 files?

Quatro Pro for Windows 7 (.wb3) 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.