diff --git a/Facepunch.Steamworks.Test/Client/AppTest.cs b/Facepunch.Steamworks.Test/Client/AppTest.cs
index 15d5494..60f703a 100644
--- a/Facepunch.Steamworks.Test/Client/AppTest.cs
+++ b/Facepunch.Steamworks.Test/Client/AppTest.cs
@@ -26,6 +26,26 @@ namespace Steamworks
 			Console.WriteLine( $"{gl}" );
 		}
 
+		[TestMethod]
+		public void AppInstallDir()
+		{
+			var str = Apps.AppInstallDir( 4000 );
+			Assert.IsNotNull( str );
+			Assert.IsTrue( str.Length > 3 );
+
+			Console.WriteLine( $"{str}" );
+		}
+
+		[TestMethod]
+		public void AppOwner()
+		{
+			var steamid = Apps.AppOwner;
+			Assert.IsTrue( steamid.Value > 70561197960279927 );
+			Assert.IsTrue( steamid.Value < 80561197960279927 );
+
+			Console.WriteLine( $"{steamid.Value}" );
+		}
+
 		[TestMethod]
 		public void InstalledDepots()
 		{
@@ -38,8 +58,6 @@ namespace Steamworks
 			{
 				Console.WriteLine( $"{depot.Value}" );
 			}
-
-			
 		}
 	}
 
diff --git a/Facepunch.Steamworks/Redux/Apps.cs b/Facepunch.Steamworks/Redux/Apps.cs
index c5ff7dc..134768f 100644
--- a/Facepunch.Steamworks/Redux/Apps.cs
+++ b/Facepunch.Steamworks/Redux/Apps.cs
@@ -152,5 +152,57 @@ namespace Steamworks
 			}
 		}
 
+		/// <summary>
+		/// Gets the install folder for a specific AppID.
+		/// This works even if the application is not installed, based on where the game would be installed with the default Steam library location.
+		/// </summary>
+		public static string AppInstallDir( AppId appid )
+		{
+			var sb = SteamNative.Helpers.TakeStringBuilder();
+
+			if ( steamapps.GetAppInstallDir( appid.Value, sb, (uint) sb.Capacity ) == 0 )
+				return null;
+
+			return sb.ToString();
+		}
+
+		/// <summary>
+		/// The app may not actually be owned by the current user, they may have it left over from a free weekend, etc.
+		/// </summary>
+		public static bool IsAppInstalled( AppId appid ) => steamapps.BIsAppInstalled( appid.Value );
+
+		/// <summary>
+		/// Gets the Steam ID of the original owner of the current app. If it's different from the current user then it is borrowed..
+		/// </summary>
+		public static SteamId AppOwner => steamapps.GetAppOwner().Value;
+
+		/// <summary>
+		/// Gets the associated launch parameter if the game is run via steam://run/<appid>/?param1=value1;param2=value2;param3=value3 etc.
+		/// Parameter names starting with the character '@' are reserved for internal use and will always return an empty string.
+		/// Parameter names starting with an underscore '_' are reserved for steam features -- they can be queried by the game, 
+		/// but it is advised that you not param names beginning with an underscore for your own features.
+		/// </summary>
+		public static string GetLaunchParam( string param ) => steamapps.GetLaunchQueryParam( param );
+
+		/// <summary>
+		/// Gets the download progress for optional DLC.
+		/// </summary>
+		public static DownloadProgress DlcDownloadProgress( AppId appid )
+		{
+			ulong punBytesDownloaded = 0;
+			ulong punBytesTotal = 0;
+
+			if ( !steamapps.GetDlcDownloadProgress( appid.Value, ref punBytesDownloaded, ref punBytesTotal ) )
+				return default( DownloadProgress );
+
+			return new DownloadProgress { BytesDownloaded = punBytesDownloaded, BytesTotal = punBytesTotal, Active = true };
+		}
+
+		/// <summary>
+		/// Gets the buildid of this app, may change at any time based on backend updates to the game.
+		/// Defaults to 0 if you're not running a build downloaded from steam.
+		/// </summary>
+		public static int BuildId => steamapps.GetAppBuildId();
+
 	}
 }
\ No newline at end of file
diff --git a/Facepunch.Steamworks/Redux/Structs/DownloadProgress.cs b/Facepunch.Steamworks/Redux/Structs/DownloadProgress.cs
new file mode 100644
index 0000000..005e8cd
--- /dev/null
+++ b/Facepunch.Steamworks/Redux/Structs/DownloadProgress.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Text;
+
+
+namespace Steamworks
+{
+	public struct DownloadProgress
+	{
+		public bool Active;
+		public ulong BytesDownloaded;
+		public ulong BytesTotal;
+	}
+}
\ No newline at end of file
diff --git a/Facepunch.Steamworks/Redux/Structs/SteamId.cs b/Facepunch.Steamworks/Redux/Structs/SteamId.cs
new file mode 100644
index 0000000..2536698
--- /dev/null
+++ b/Facepunch.Steamworks/Redux/Structs/SteamId.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Text;
+
+
+namespace Steamworks
+{
+	public struct SteamId
+	{
+		public ulong Value;
+
+		public static implicit operator SteamId( ulong value )
+		{
+			return new SteamId { Value = value };
+		}
+
+		public static implicit operator ulong( SteamId value )
+		{
+			return value.Value;
+		}
+	}
+}
\ No newline at end of file