The New Gegamo Manifest App
The fastest way to set up OpenSteamTool, manage manifests, and enable Online Fix lobby multiplayer. Inspired by LuaTools & Project Lightning — completely upgraded.
Windows 10/11 x64 · Steam installed · No admin rights needed
What's in this release
Everything you need: Online Fix, Library Manager, Auto-Updater & Tools.
One-Click Auto Setup
One click does everything: stops Steam, installs OpenSteamTool into your Steam root, configures config\lua, requests Defender exclusions, and starts Steam again.
Online Fix & Lobby Matchmaking
Enable multiplayer in games using Steam's -onlinefix launch parameter and Spacewar (AppID 480) routing. Includes automatic Steam config backups and restore tools.
Installed Packages Library
Full library manager inspired by LuaTools. Browse installed games, cover art, and manifests, launch directly in Steam, or toggle Online Fix on any game with one click.
Live AppID & URL Installer
Paste any Steam store URL or type an App ID — live game title and cover art preview as you type, then fetch, clean, and install with zero Steam restarts.
Drag & Drop Archives
Drop any .zip package on the window. Junk files (readmes, licenses, .nfo, __MACOSX) are stripped automatically before installing to config\lua.
Smart Steam Process Control
Live status detection: know whether Steam is running, restart with one click, or terminate hung Steam background processes cleanly.
Integrated Auto-Updater
Automatic GitHub release checks on startup with a one-click upgrade notification banner, plus OpenSteamTool binary update checks.
Defender & Cache Utilities
One-click Windows Defender folder exclusions with verification, Steam download cache flushing, and shortcuts to Steam and Lua folders.
Requirements
- Windows 10/11 x64
- Steam installed
- No admin rights needed
Notes
- Not affiliated with Valve or Steam. Use at your own risk.
- If Steam keeps wiping files: turn off real-time protection, add the exclusions (Settings), then REINSTALL.
- Online Fix enables multiplayer via lobby matchmaking (AppID 480).
- Closed source — see LICENSE for terms. (There is an active petition to make Gegamo Manifest Open Source)