No folder names leading to the game directory should contain a space. For example, the directory "C:\Users\Username\Desktop\Misc\YoutubeRetro" have no folders with a space between them.
Where people cannot play the videos is when any of these folder names contain a space between them. For example, the directory "C:\Users\Username\Desktop\NEW FOLDER\YoutubeRetro" would not allow the program to playback videos, because the folder name "NEW FOLDER" contain spaces.