# 3F 5F — File format magic numbers

For 3F 5F, offset is 0; extension is hlp; format is Windows 3.x/95/98 Help file, recorded from its source on 2026-08-03.

- **Hex signature:** 3F 5F _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0 _(unconfirmed — we could not tie this to the quote below)_
- **Extension:** hlp _(unconfirmed — we could not tie this to the quote below)_
- **Format:** Windows 3.x/95/98 Help file

## What the source says

> Windows 3.x/95/98 Help file

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-08-03. Review by: 2027-08-03.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).