---
type: lookup
id: hlp-3f-5f
asset: file-format-signatures
title: "3F 5F — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "Windows 3.x/95/98 Help file"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "3F 5F"
offset: "0"
extension: "hlp"
format: "Windows 3.x/95/98 Help file"
unverified_fields: extension, hex_signature, offset
---
**Hex signature:** 3F 5F

**Offset:** 0

**Extension:** hlp

**Format:** Windows 3.x/95/98 Help file

> Windows 3.x/95/98 Help file

Source: <https://en.wikipedia.org/wiki/List_of_file_signatures>