Convert LGU firmware update package files used by Dacia & Renault MediaNav systems.

An LGU file is a firmware update package used by Renault & Dacia MediaNav and R-Link navigation and entertainment systems (which run on Windows CE 6.0).
The firmware update is usually stored on a USB drive and then installed on the MediaNav.
m-a-x-s-e-e-l-i-g/MediaNav-to-Evolution-Upgrade contains a guide on how to upgrade MediaNav, and also contains two LGU files.

To extract the contents of an LGU file, run the following command in a terminal window:
lgu2dir.exe <input lgu file> <output folder>

To create an LGU file from a folder, run the following command in a terminal window:
dir2lgu.exe <input folder> <output lgu file>
example: .\lgu2dir.exe upgrade.lgu output

I have no idea who created these tools, I found them on some forum and they work. I uploaded them here so they are easier to find and use, and to prevent them from getting lost.

You'll find the source code here if you want to compile it yourself: yosicovich/MediaNavMods