diff --git a/rwengine/src/engine/GameData.cpp b/rwengine/src/engine/GameData.cpp
index 3cd34bb2..48c1e121 100644
--- a/rwengine/src/engine/GameData.cpp
+++ b/rwengine/src/engine/GameData.cpp
@@ -14,65 +14,13 @@
 #include <loaders/LoaderGXT.hpp>
 #include <loaders/BackgroundLoader.hpp>
 #include <core/Logger.hpp>
+#include <platform/FileIndex.hpp>
 
 #include <iostream>
 #include <fstream>
 #include <sstream>
 #include <algorithm>
 
-#ifndef RW_WINDOWS
-#include <dirent.h>
-#else
-#include <platform/msdirent.h>
-#endif
-#include <sys/types.h>
-
-/**
- * Finds the 'real' case for a path, to get around the fact that Rockstar's data is usually the wrong case.
- * @param base The base of the path to start looking from.
- * @param path the lowercase path.
- */
-std::string findPathRealCase(const std::string& base, const std::string& path) 
-{
-#ifndef RW_WINDOWS
-	size_t endslash = path.find("/");
-	bool isDirectory = true;
-	if(endslash == path.npos) {
-		isDirectory = false;
-	}
-	std::string orgFileName = isDirectory ? path.substr(0, endslash) : path;
-	std::transform(orgFileName.begin(), orgFileName.end(), orgFileName.begin(), ::tolower);
-	std::string realName;
-	
-	// Open the current "base" path (i.e. the real path)
-	DIR* dp = opendir(base.c_str());
-	dirent* ep;
-	
-	if( dp != NULL) {
-		while( (ep = readdir(dp)) ) {
-			realName = ep->d_name;
-			std::string lowerRealName = realName;
-			std::transform(lowerRealName.begin(), lowerRealName.end(), lowerRealName.begin(), ::tolower);
-			if( lowerRealName == orgFileName) {
-				closedir(dp);
-				if( isDirectory) {
-					return findPathRealCase(base + "/" + realName, path.substr(endslash+1));
-				}
-				else {
-					return base + "/" + realName;
-				}
-			}
-		}
-		closedir(dp);
-	}
-
-	return "";
-#else 
-	// Is anything other than Windows likely to fall here?
-	return base + "/" + path;
-#endif
-}
-
 // Yet another hack function to fix these paths
 std::string fixPath(std::string path) {
 	for( size_t t = 0; t < path.size(); ++t) {
@@ -84,7 +32,6 @@ std::string fixPath(std::string path) {
 	return path;
 }
 
-
 GameData::GameData(Logger* log, WorkContext* work, const std::string& path)
 : datpath(path), logger(log), workContext(work), engine(nullptr)
 {
diff --git a/rwlib/source/platform/FileIndex.cpp b/rwlib/source/platform/FileIndex.cpp
index de2c52d0..e8e6401f 100644
--- a/rwlib/source/platform/FileIndex.cpp
+++ b/rwlib/source/platform/FileIndex.cpp
@@ -6,6 +6,43 @@
 
 using namespace boost::filesystem;
 
+/**
+ * Finds the 'real' case for a path, to get around the fact that Rockstar's data is usually the wrong case.
+ * @param base The base of the path to start looking from.
+ * @param path the lowercase path.
+ */
+std::string findPathRealCase(const std::string& base_src, const std::string& path_src)
+{
+	path base(base_src);
+	path searchpath(path_src);
+
+	// Iterate over each component of the path
+	for(const path& path_component : searchpath) {
+		std::string cmp_lower = path_component.string();
+		std::transform(cmp_lower.begin(), cmp_lower.end(), cmp_lower.begin(), ::tolower);
+
+		// Search the current base path for a filename matching the component we're searching for
+		bool found = false;
+		for(const directory_entry& entry : directory_iterator(base)) {
+			std::string lowerName = entry.path().filename().string();
+			std::transform(lowerName.begin(), lowerName.end(), lowerName.begin(), ::tolower);
+
+			if(lowerName == cmp_lower) {
+				// We got a match, so add it to base and continue
+				base /= lowerName;
+				found = true;
+				break;
+			}
+		}
+
+		if(!found) {
+			throw std::runtime_error("Can't find real path case of " + path_src);
+		}
+	}
+
+	return base.string();
+}
+
 void FileIndex::indexTree(const std::string& root)
 {
 	for(const auto& entry : recursive_directory_iterator(root)) {
diff --git a/rwlib/source/platform/FileIndex.hpp b/rwlib/source/platform/FileIndex.hpp
index 11f332e1..2d9e6b0f 100644
--- a/rwlib/source/platform/FileIndex.hpp
+++ b/rwlib/source/platform/FileIndex.hpp
@@ -4,6 +4,8 @@
 #include <string>
 #include <map>
 
+std::string findPathRealCase(const std::string& base_src, const std::string& path_src);
+
 class FileIndex
 {
 public: