: Go to Windows Settings > Apps > Optional features > More Windows features and ensure .NET Framework 3.5 (includes .NET 2.0 and 3.0) is checked and installed.
. Reddit +11 Community Experiences Users on forums have shared varying success with these manual tweaks: “Change to Borderless Window in config files. Go to XCom-Enemy-Unknown\Engine\Config to the BaseEngine file, search 'window' and change Fullscreen to FALSE, and Borderless Window to TRUE.” Reddit · r/Xcom xcom: enemy unknown not launching windows 11
Go to your game installation folder (usually SteamLibrary\steamapps\common\XCom-Enemy-Unknown\Binaries\Win32 ). Right-click and select Properties . Under the Compatibility tab: : Go to Windows Settings > Apps >
Check the box for and click Apply . Force Borderless Windowed Mode : Force Borderless Windowed Mode : Worth the tinkering
Worth the tinkering for strategy fans. For casual players, skip unless you enjoy tech detective work.
Run the legacy and Visual C++ Redistributable (2010 x86) installers found in the game's _CommonRedist or Redist folder. Quick Troubleshooting Steps
Windows 11 may not automatically install the older runtimes required by XCOM.