- Official Post
Yes but how do you convert your sounds? You must have tried to start an application or something, the error message looks like you tried to start an executable but instead of giving the path to that executable you used just a folder path.
Your custom sounds don't belong into the Steam installation folder, use the user folder for this (c documents, aerofly fs 2). If you keep your own files in the steam installation folder the next steam update could wipe them from your hard drive.