Refactored how location of the game is aquired to a simpler version.

Core/Core.csproj

@@ -393,6 +393,7 @@
     <Compile Include="Field\WalkMesh\Vert.cs" />
     <Compile Include="Field\WalkMesh\WalkMesh.cs" />
     <Compile Include="FPSCounter.cs" />
+    <Compile Include="GameDirectoryFinder.cs" />
     <Compile Include="Image\Bppflag.cs" />
     <Compile Include="Image\Cluts.cs" />
     <Compile Include="Image\ColorABGR1555.cs" />
@@ -1117,11 +1118,6 @@
     <Compile Include="Saves\Saves.TripleTriad.cs" />
     <Compile Include="Saves\Saves.Worldmap.cs" />
     <Compile Include="Sources\Environment\Build\BuildEnvironment.cs" />
-    <Compile Include="Sources\Environment\Game\Location\GameLocation.cs" />
-    <Compile Include="Sources\Environment\Game\Location\HardcodedGameLocationProvider.cs" />
-    <Compile Include="Sources\Environment\Game\Location\IGameLocationProvider.cs" />
-    <Compile Include="Sources\Environment\Game\Location\LinuxGameLocationProvider.cs" />
-    <Compile Include="Sources\Environment\Game\Location\WindowsGameLocationProvider.cs" />
     <Compile Include="Sources\Environment\Runtime\RuntimeEnvironment.cs" />
     <Compile Include="Sources\Environment\Runtime\RuntimePlatform.cs" />
     <Compile Include="Sources\Exceptions\ExceptionList.cs" />
@@ -1295,7 +1291,9 @@
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>
-  <ItemGroup />
+  <ItemGroup>
+    <Folder Include="Sources\Environment\Game\Location\" />
+  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Encoding\Encoding.csproj">
       <Project>{a9b33bf4-9b03-4e3d-bf6a-181521046ee8}</Project>

Core/GameDirectoryFinder.cs

@@ -0,0 +1,111 @@
+using Microsoft.Win32;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace OpenVIII.Core {
+
+    /// <summary>
+    /// Class is resposible for finding the root directory where Final Fantasy VIII is stored.
+    /// </summary>
+    public static class GameDirectoryFinder 
+    {
+        /// <summary>
+        /// Looks for root directory where the game is installed.
+        /// </summary>
+        /// <returns>Path to a directory where the game is installed.</returns>
+        public static string FindRootGameDirectory()
+        {
+            return RuntimeEnvironment.Platform switch
+            {
+                RuntimePlatform.Windows => WindowsRootGameDirectory(),
+                RuntimePlatform.Linux => LinuxRootGameDirectory(),
+                _ => throw new NotSupportedException(RuntimeEnvironment.Platform.ToString()),
+            };
+        }
+
+        private static string WindowsRootGameDirectory()
+        {
+            var commonRoots = new string[]
+            {
+                @"C:\Program Files (x86)\Steam\steamapps\common\FINAL FANTASY VIII",
+                @"D:\SteamLibrary\steamapps\common\FINAL FANTASY VIII",
+                @"D:\Steam\steamapps\common\FINAL FANTASY VIII",
+            };
+
+            if (commonRoots.Where(path => Directory.Exists(path)).Any())
+                return commonRoots.Where(path => Directory.Exists(path)).First();
+
+            var registryRoots = RootsFromRegistry();
+
+            if (registryRoots.Where(path => Directory.Exists(path)).Any())
+                return registryRoots.Where(path => Directory.Exists(path)).First();
+
+            throw new DirectoryNotFoundException($"Cannot find game directory." +
+                                                 $"Add your own path to the {nameof(WindowsRootGameDirectory)}.");
+        }
+
+        private static List<string> RootsFromRegistry()
+        {
+            // Now, we are looking into registers.
+            #region Registries paths and tags
+
+            // Steam 2013
+            const string SteamRegistryPath = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Steam App 39150";
+            const string SteamGamePathTag = @"InstallLocation";
+
+            // Supplied from LordUrQuan
+            const string CD2000RegistryPath = @"SOFTWARE\Wow6432Node\Square Soft, Inc\FINAL FANTASY VIII\1.00";
+            const string CD2000GamePathTag = @"AppPath";
+
+            // Steam Remaster
+            const string SteamRERegistryPath = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Steam App 1026680";
+            const string SteamREGamePathTag = @"InstallLocation";
+            #endregion
+
+            var regs = new Dictionary<string, string>()
+            {
+                {SteamRegistryPath, SteamGamePathTag},
+                {CD2000RegistryPath, CD2000GamePathTag},
+                {SteamRERegistryPath, SteamREGamePathTag}
+            };
+
+            var regValues = new List<string>();
+            foreach (var pair in regs)
+            {
+                regValues.Add(ValueFromRegistry(pair.Key, pair.Value, RegistryView.Registry32));
+                regValues.Add(ValueFromRegistry(pair.Key, pair.Value, RegistryView.Registry64));
+            }
+
+            return regValues;
+        }
+
+        private static string ValueFromRegistry(string subKey, string valueName, RegistryView view)
+        {
+            using var baseKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, view);
+            using var key = baseKey.OpenSubKey(subKey);
+
+            // Starting from C# 6 we can use Null-conditional operator (?.)
+            // https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/member-access-operators#null-conditional-operators--and-
+            return (string)key?.GetValue(valueName);
+        }
+
+        private static string LinuxRootGameDirectory()
+        {
+            var commonRoots = new string[]
+            {
+                @"/home/robert/Final Fantasy VIII",
+                @"/media/griever/Data/SteamLibrary/steamapps/common/FINAL FANTASY VIII",
+                @"/home/griever/.PlayOnLinux/wineprefix/Steam/drive_c/Program Files/Steam/steamapps/common/FINAL FANTASY VIII",
+                @"/home/parallels/src/ff8/steam"
+            };
+
+            if (commonRoots.Where(path => Directory.Exists(path)).Any())
+                return commonRoots.Where(path => Directory.Exists(path)).First();
+
+            throw new DirectoryNotFoundException($"Cannot find game directory." +
+                                                 $"Add your own path to the {nameof(LinuxRootGameDirectory)}.");
+        }
+    }
+}

Core/Memory.cs

@@ -1,6 +1,8 @@
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
+using OpenVIII;
+using OpenVIII.Core;
 using OpenVIII.Kernel;
 using System;
 using System.Collections.Concurrent;
@@ -833,9 +835,8 @@ public static void Init(GraphicsDeviceManager graphics, SpriteBatch spriteBatch,
             Log.WriteLine($"{nameof(Memory)} :: {nameof(MainThreadOnlyActions)}");
             MainThreadOnlyActions = new ConcurrentQueue<Action>();
 
-            FF8Dir = GameLocation.Current.DataPath;
-            void SetData() =>
-            FF8DirData = Extended.GetUnixFullPath(Path.Combine(FF8Dir, "Data"));
+            FF8Dir = GameDirectoryFinder.FindRootGameDirectory();
+            void SetData() => FF8DirData = Extended.GetUnixFullPath(Path.Combine(FF8Dir, "Data"));
 
             SetData();
             var languageSet = false;