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WQ1 (.wq1)

.wq1 file signature | application/x-quattro-pro;version=1-4

WQ1 is a legacy spreadsheet file format associated with Quattro Pro, originally developed by Borland and later maintained by Corel. It was used for storing worksheets, formulas, and related workbook data in early versions of the application for business and personal calculations. The format is now largely obsolete, and files should be opened with trusted spreadsheet software because older documents may contain compatibility issues rather than active security risks.

Safe

Magic Bytes

Offset 0
00 00 02 00 20 51

Sources: Apache Tika

Extension

.wq1

MIME Type

application/x-quattro-pro;version=1-4

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .wq1 files in Python

Python 
def is_wq1(file_path: str) -> bool:
    """Check if file is a valid WQ1 by magic bytes."""
    signature = bytes([0x00, 0x00, 0x02, 0x00, 0x20, 0x51])
    with open(file_path, "rb") as f:
        return f.read(6) == signature

How to validate .wq1 files in Node.js

Node.js 
function isWQ1(buffer: Buffer): boolean {
  const signature = Buffer.from([0x00, 0x00, 0x02, 0x00, 0x20, 0x51]);
  return buffer.subarray(0, 6).equals(signature);
}

How to validate .wq1 files in Go

Go 
func IsWQ1(data []byte) bool {
    signature := []byte{0x00, 0x00, 0x02, 0x00, 0x20, 0x51}
    if len(data) < 6 {
        return false
    }
    return bytes.Equal(data[:6], signature)
}

API Endpoint

GET /api/v1/wq1
curl https://filesignature.org/api/v1/wq1

See the full API documentation for all endpoints and parameters.

Related Formats

.wkq .wb1 .wb2 .wk1 .wk2 .wq2

Frequently Asked Questions

What is a .wq1 file?

A .wq1 file is identified by the magic bytes 00 00 02 00 20 51 at byte offset 0. WQ1 is a legacy spreadsheet file format associated with Quattro Pro, originally developed by Borland and later maintained by Corel. It was used for storing worksheets, formulas, and related workbook data in early versions of the application for business and personal calculations. The format is now largely obsolete, and files should be opened with trusted spreadsheet software because older documents may contain compatibility issues rather than active security risks.

What are the magic bytes for .wq1 files?

The magic bytes for WQ1 files are 00 00 02 00 20 51 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .wq1 file?

To validate a .wq1 file, read the first bytes of the file and compare them against the known magic bytes (00 00 02 00 20 51) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .wq1 files?

The primary MIME type for .wq1 files is application/x-quattro-pro;version=1-4.

Is it safe to open .wq1 files?

WQ1 (.wq1) 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.