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Heroes 5 somehow launches in windowed mode on my computer. The only way to fix it is to set the resolution to 1280x1024, but then the game runs slowly.
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Technical Support for Heroes 5. This section is created specifically to avoid creating numerous threads of the type ("Please help"). If you want to create a new thread, do so in the following format: "Error when launching Heroes 5 on GeForce 6600" - approximately in this style.
Attention: Describe your problem in detail and, if possible, attach a screenshot; otherwise, the first replies to your question will ask for clarification.
Set `gfx_fullscreen = 1` in the `user.cfg` file. Try adding this line to the config and running the game in the same mode as your desktop.
P.S. What version of Windows are you using? What is your desktop resolution?