diff --git a/Wabbajack.Common/GameMetaData.cs b/Wabbajack.Common/GameMetaData.cs
index b89f50ac..714d3cb1 100644
--- a/Wabbajack.Common/GameMetaData.cs
+++ b/Wabbajack.Common/GameMetaData.cs
@@ -1,5 +1,7 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.ComponentModel;
+using System.Diagnostics;
 using System.Linq;
 using Alphaleonis.Win32.Filesystem;
 using Microsoft.Win32;
@@ -68,6 +70,21 @@ namespace Wabbajack.Common
         // file to check if the game is present, useful when steamIds and gogIds dont help
         public List<string> RequiredFiles { get; internal set; }
         public bool Disabled { get; internal set; }
+        
+        public string InstalledVersion
+        {
+            get
+            {
+                if (GameLocation() == null)
+                    throw new GameNotInstalledException(this);
+                if (MainExecutable == null)
+                    throw new NotImplementedException();
+
+                return FileVersionInfo.GetVersionInfo(Path.Combine(GameLocation(), MainExecutable)).ProductVersion;
+            }
+        }
+        
+        public string MainExecutable { get; internal set; }
 
         public string GameLocation()
         {
@@ -79,6 +96,13 @@ namespace Wabbajack.Common
         }
     }
 
+    public class GameNotInstalledException : Exception
+    {
+        public GameNotInstalledException(GameMetaData gameMetaData) : base($"Game {gameMetaData.Game} does not appear to be installed.")
+        {
+        }
+    }
+
     public class GameRegistry
     {
         public static GameMetaData GetByMO2ArchiveName(string gameName)
@@ -125,7 +149,8 @@ namespace Wabbajack.Common
                     RequiredFiles = new List<string>
                     {
                         "oblivion.exe"
-                    }
+                    },
+                    MainExecutable = "Oblivion.exe"
                 }
             },
 
@@ -143,7 +168,8 @@ namespace Wabbajack.Common
                     {
                         "falloutlauncher.exe",
                         "data\\fallout3.esm"
-                    }
+                    },
+                    MainExecutable = "Fallout3.exe"
                 }
             },
             {
@@ -159,7 +185,8 @@ namespace Wabbajack.Common
                     RequiredFiles = new List<string>
                     {
                         "FalloutNV.exe"
-                    }
+                    },
+                    MainExecutable = "FalloutNV.exe"
                 }
             },
             {
@@ -175,7 +202,8 @@ namespace Wabbajack.Common
                     RequiredFiles = new List<string>
                     {
                         "tesv.exe"
-                    }
+                    },
+                    MainExecutable = "TESV.exe"
                 }
             },
             {
@@ -191,7 +219,8 @@ namespace Wabbajack.Common
                     RequiredFiles = new List<string>
                     {
                         "SkyrimSE.exe"
-                    }
+                    },
+                    MainExecutable = "SkyrimSE.exe"
                 }
             },
             {
@@ -207,7 +236,8 @@ namespace Wabbajack.Common
                     RequiredFiles = new List<string>
                     {
                         "Fallout4.exe"
-                    }
+                    },
+                    MainExecutable = "Fallout4.exe"
                 }
             },
             /*{
diff --git a/Wabbajack.Common/SteamHandler.cs b/Wabbajack.Common/SteamHandler.cs
index 3dfbbec3..5e44f28e 100644
--- a/Wabbajack.Common/SteamHandler.cs
+++ b/Wabbajack.Common/SteamHandler.cs
@@ -132,8 +132,6 @@ namespace Wabbajack.Common
                                 return;
                         if(l.Contains("\"name\""))
                             steamGame.Name = GetVdfValue(l);
-                        if (l.Contains("\"buildid\""))
-                            steamGame.BuildId = GetVdfValue(l);
                         if (l.Contains("\"installdir\""))
                         {
                             var path = Path.Combine(p, "common", GetVdfValue(l));
diff --git a/Wabbajack.Lib/Downloaders/GameFileSourceDownloader.cs b/Wabbajack.Lib/Downloaders/GameFileSourceDownloader.cs
index 680ae6bf..80c8eb63 100644
--- a/Wabbajack.Lib/Downloaders/GameFileSourceDownloader.cs
+++ b/Wabbajack.Lib/Downloaders/GameFileSourceDownloader.cs
@@ -37,6 +37,7 @@ namespace Wabbajack.Lib.Downloaders
                 Game = GameRegistry.GetByMO2ArchiveName(gameName).Game, 
                 GameFile = gameFile,
                 Hash = hash,
+                GameVersion = GameRegistry.GetByMO2ArchiveName(gameName).InstalledVersion
             };
         }
 
@@ -49,10 +50,12 @@ namespace Wabbajack.Lib.Downloaders
             public Game Game { get; set; }
             public string GameFile { get; set; }
             public string Hash { get; set; }
+            
+            public string GameVersion { get; set; }
 
             internal string SourcePath => Path.Combine(Game.MetaData().GameLocation(), GameFile);
 
-            public override object[] PrimaryKey { get => new object[] {Game, GameFile}; }
+            public override object[] PrimaryKey { get => new object[] {Game, GameVersion, GameFile}; }
 
             public override bool IsWhitelisted(ServerWhitelist whitelist)
             {