用记事本打开steam/steamapps/libraryfolders.vdf，然后按照格式添加条目
"LibraryFolders"
{
"TimeNextStatsReport" "xxxxxxxxx"
"ContentStatsID" "xxxxxxxxxxxxxx"
"1" "D:\Games\Steam Games"
"2" "E:\Steam"
"3" "C:\SteamLibrary"
}