# 50 4D 43 43 — File format magic numbers

For 50 4D 43 43, offset is 50; extension is grp; format is Windows 3.x Program Manager Program Group file format, recorded from its source on 2026-08-03.

- **Hex signature:** 50 4D 43 43
- **Offset:** 50
- **Extension:** grp
- **Format:** Windows 3.x Program Manager Program Group file format _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> 3 64 62 66 | sdbf | 8 | sdb | Windows customized database | 50 4D 43 43 | PMCC | 0 | grp | Windows 3.x <https://en.wikipedia.org/wiki/Program_Manager> Program Manager Program Group file format | 4B 43 4D 53 | KCMS | 0 | icm | <https://en.wikipedia.org/wiki/ICC_profile> ICC profile | 72 65 67 66 | regf | 0 | dat hiv | <https://en.wikipedia.org/wiki/Windows_Re

## 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/).