The game works fine for me on Windows 10 and Windows 11. In Xubuntu on Linux too.
The Steam version of the game is 1.01 (according to version.inf in GameData), so there is no need to install an update.
In the Steam library, there is a "Manage" button in the game overview (a gear wheel). It opens a menu with "Manage/Browse local files" option. Once selected, the File Explorer will open.
The game does not offer a widescreen resolution in the setup, but you can set it manually.