Quick test at getting Morrowinds install path from the registry on windows

components/files/path.hpp

@@ -30,7 +30,7 @@
     #include <components/files/linuxpath.hpp>
     namespace Files { typedef LinuxPath TargetPathType; }
 
-#elif defined(__WIN32) || defined(__WINDOWS__)
+#elif defined(__WIN32) || defined(__WINDOWS__) || defined(_WINDOWS)
     #include <components/files/windowspath.hpp>
     namespace Files { typedef WindowsPath TargetPathType; }
 

components/files/windowspath.cpp

@@ -5,7 +5,10 @@
 #include <cstring>
 
 #include <windows.h>
-#include <shobj.h>
+#include <shlobj.h>
+#include <Shlwapi.h>
+
+#pragma comment(lib, "Shlwapi.lib")
 
 namespace Files
 {
@@ -67,6 +70,38 @@ boost::filesystem::path WindowsPath::getRuntimeDataPath() const
     return boost::filesystem::path("./data/");
 }
 
+boost::filesystem::path WindowsPath::getInstallPath() const
+{
+    boost::filesystem::path installPath("");
+
+    HKEY hKey;
+
+    BOOL f64 = FALSE;
+    LPCTSTR regkey;
+    if (IsWow64Process(GetCurrentProcess(), &f64) && f64)
+    {
+        regkey = "SOFTWARE\\Wow6432Node\\Bethesda Softworks\\Morrowind";
+    }
+    else
+    {
+        regkey = "SOFTWARE\\Bethesda Softworks\\Morrowind";
+    }
+
+    if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT(regkey), 0, KEY_ALL_ACCESS, &hKey) == ERROR_SUCCESS)
+    {
+        //Key existed, let's try to read the install dir
+        char* data = new char[4096];
+        int len = 4096;
+
+        if (RegQueryValueEx(hKey, TEXT("Installed Path"), NULL, NULL, (LPBYTE)data, (LPDWORD)&len) == ERROR_SUCCESS)
+        {
+            installPath = data;
+        }
+    }
+
+    return installPath;
+}
+
 } /* namespace Files */
 
 #endif /* defined(_WIN32) || defined(__WINDOWS__) */

components/files/windowspath.hpp

@@ -81,6 +81,13 @@ struct WindowsPath
      * \return boost::filesystem::path
      */
     boost::filesystem::path getRuntimeDataPath() const;
+
+    /**
+     * \brief Gets the path of the installed Morrowind version if there is one.
+     *
+     * \return boost::filesystem::path
+     */
+    boost::filesystem::path getInstallPath() const;
 };
 
 } /* namespace Files */