Which file (including location) do I need to edit? I'm very familiar with XML files (I prefer Sublime as the editor personally), but the only platform.xml file I found was in /LaunchBox/Metadata/ and it didn't have any information about folders.
Nope, found it, under /LaunchBox/Data/ heh. That being said, I know I've got a ton of assets for many platforms, and all of the tags are empty:
<Folder>D:\Games\Emulation\NES</Folder>
<Notes>The Nintendo Entertainment System is an 8-bit video game console that was released by Nintendo in North America during 1985, in Europe during 1986 and Australia in 1987. In most of Asia, including Japan (where it was first launched in 1983), China, Vietnam, Singapore, the Middle East and Hong Kong, it was released as the Family Computer, commonly shortened as either the romanized contraction Famicom, or abbreviated to FC. In South Korea, it was known as the Hyundai Comboy, and was distributed by Hynix which then was known as Hyundai Electronics.</Notes>
<VideosFolder />
<FrontImagesFolder />
<BackImagesFolder />
<ClearLogoImagesFolder />
<FanartImagesFolder />
<ScreenshotImagesFolder />
<BannerImagesFolder />
<SteamBannerImagesFolder />
<ManualsFolder />
<MusicFolder />
<ScrapeAs>Nintendo Entertainment System</ScrapeAs>
<VideoPath>Videos\Platforms\Nintendo Entertainment System.mp4</VideoPath>
The video one I can edit, but the rest, not sure why they're blank.