CompactGUI is a Windows‑only GUI front‑end for the built‑in **compact.exe** utility, letting users transparently compress game and program folders to reclaim disk space without altering how the software runs. It targets PC gamers and power users who want an easy way to apply the newer Windows 10+ compression algorithms (XPRESS, LZX) and includes extra features such as progress stats, a community compression database, Explorer context‑menu integration, and a background watcher that re‑compresses updated folders.