Visio/DisplayWrite 4 text file
application/octet-stream
Magic Bytes
Offset: 0
50 00 00 00 20 00 00 00
Visio/DisplayWrite 4 text file is a legacy word processing format developed by International Business Machines (IBM) for use in DOS-based personal and mainframe computing environments. It was primarily utilized for drafting, formatting, and archiving business documents during the era of text-based word processing software prior to the widespread adoption of graphical editors. As an obsolete format, it poses minimal security risks, though accessing content now requires specific legacy conversion utilities or vintage software emulators.
Validation Code
How to validate .dw4 files in Python
Python
def is_dw4(file_path: str) -> bool:
"""Check if file is a valid DW4 by magic bytes."""
signature = bytes([0x50, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00])
with open(file_path, "rb") as f:
return f.read(8) == signatureHow to validate .dw4 files in Node.js
Node.js
function isDW4(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00]);
return buffer.subarray(0, 8).equals(signature);
}
Go
func IsDW4(data []byte) bool {
signature := []byte{0x50, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00}
if len(data) < 8 {
return false
}
return bytes.Equal(data[:8], signature)
}API Endpoint
GET
/api/v1/dw4
curl https://filesignature.org/api/v1/dw4