Game doesn't launch unless run in windowed mode, although fullscreen mode can be toggled safely afterwards either by pressing Alt+Enter or manually changing the setting from the F5 menu.

I kept getting "OLE error 40008001" everytime I went from the Block World to The White Desert, so progressing was impossible for me past this point.

mpg123 and libmpg123 were already installed in my system and it made no difference.