Hi TR. Thanks for your reply! After posting here, I looked at the Steam Community threads for this game, and found a post saying the following: This helped me. Startoptions (Rightclick on C&C in SteamLibary - Properties - Startoption): -win . The game started in windowed mode... First start of the game creates a Profile under "C:\Users\xxxxxx\AppData\Roaming\Command & Conquer 3 Tiberium Wars\Profiles... ". Here i found the Option.ini. i opened it with a Texteditor, searched for Resolution and set it the Same as my Screenresolution. Before 800 600 , now 1920 1080. Last step, startoptions again. Before -win now -win -fullscreen -xpos 0 -ypos 0 can be copied from here. Addition: with Mods Startoptionen: -ui -win -fullscreen -xpos 0 -ypos 0 Adding the -win part helped solve the problem. The screen is still small, but at least it works! :) I might try the other parts of the above post soon. Thanks again.