The New Gegamo Manifest App
The fastest way to set up OpenSteamTool and install Steam manifest packages. Black & white, one screen, no clutter.
Windows 10/11 x64 · Steam installed · No admin rights needed
What's in this release
Everything you need, one screen, zero clutter.
Auto Setup
One click: closes Steam, installs OpenSteamTool into your Steam root, creates config\lua, adds Defender exclusions (UAC prompt), and launches Steam again.
AppID Installer
Paste a Steam store URL or type an App ID — live game name + availability check as you type, then fetch → extract → clean → install with zero Steam restarts.
Drag & Drop
Drop any .zip on the window. Garbage files (readmes, licenses, __MACOSX, etc.) are stripped automatically.
Smart Steam Button
Knows if Steam is running — offers OPEN STEAM or RESTART STEAM, exactly when you need it.
Reinstall
One-click reset if Steam wipes your files. Back up and running in seconds.
Defender Exclusion Helper
With verification, so Windows stops eating your manifest files.
Manual Update Check
Nothing downloads unless you click it. Full control, always.
Proper Installer
Start Menu entry, desktop shortcut, and uninstaller — plus a portable single-exe build if you prefer no install.
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.
- Closed source — see LICENSE for terms.