in the steamapps folder you'll see a bunch of appmanifest_#####.acf files, the # are the app id for the game, but also other information such as where the game's directory is and it's name. using Notepad++. Open the "Find in Files" dialog with CtrlShiftF; in "Find What" enter the name of the game; in "Filter" put in *.acf More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.