diff --git a/src/engine.cpp b/src/engine.cpp
index 8e5584c7..3c957507 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -70,7 +70,7 @@ Engine::Engine(EngineSettings& settings, EnginePaths* paths)
 
     auto resdir = paths->getResources();
 
-    std::vector<fs::path> roots {resdir};
+    std::vector<std::pair<std::string, fs::path>> roots {};
     resPaths = std::make_unique<ResPaths>(resdir, roots);
     try {
         loadAssets();
@@ -241,9 +241,9 @@ void Engine::loadContent() {
     names = manager.assembly(names);
     contentPacks = manager.getAll(names);
 
-    std::vector<fs::path> resRoots;
+    std::vector<std::pair<std::string, fs::path>> resRoots;
     for (auto& pack : contentPacks) {
-        resRoots.push_back(pack.folder);
+        resRoots.push_back({pack.id, pack.folder});
 
         ContentLoader loader(&pack);
         loader.load(contentBuilder);
diff --git a/src/files/engine_paths.cpp b/src/files/engine_paths.cpp
index 59975a25..bd5f8fdf 100644
--- a/src/files/engine_paths.cpp
+++ b/src/files/engine_paths.cpp
@@ -4,6 +4,7 @@
 #include <sstream>
 #include <filesystem>
 
+#include "../util/stringutil.h"
 #include "../typedefs.h"
 #include "WorldFiles.h"
 
@@ -152,14 +153,14 @@ fs::path EnginePaths::resolve(std::string path) {
     throw files_access_error("unknown entry point '"+prefix+"'");
 }
 
-ResPaths::ResPaths(fs::path mainRoot, std::vector<fs::path> roots) 
+ResPaths::ResPaths(fs::path mainRoot, std::vector<std::pair<std::string, fs::path>> roots) 
     : mainRoot(mainRoot), roots(roots) {
 }
 
 fs::path ResPaths::find(const std::string& filename) const {
     for (int i = roots.size()-1; i >= 0; i--) {
         auto& root = roots[i];
-        fs::path file = root / fs::u8path(filename);
+        fs::path file = root.second / fs::u8path(filename);
         if (fs::exists(file)) {
             return file;
         }
@@ -167,11 +168,25 @@ fs::path ResPaths::find(const std::string& filename) const {
     return mainRoot / fs::u8path(filename);
 }
 
+std::string ResPaths::findRaw(const std::string& filename) const {
+    for (int i = roots.size()-1; i >= 0; i--) {
+        auto& root = roots[i];
+        if (fs::exists(root.second / fs::path(filename))) {
+            return root.first+":"+filename;
+        }
+    }
+    auto resDir = mainRoot;
+    if (fs::exists(resDir / fs::path(filename))) {
+        return "core:"+filename;
+    }
+    throw std::runtime_error("could not to find file "+util::quote(filename));
+}
+
 std::vector<fs::path> ResPaths::listdir(const std::string& folderName) const {
     std::vector<fs::path> entries;
     for (int i = roots.size()-1; i >= 0; i--) {
         auto& root = roots[i];
-        fs::path folder = root / fs::u8path(folderName);
+        fs::path folder = root.second / fs::u8path(folderName);
         if (!fs::is_directory(folder))
             continue;
         for (const auto& entry : fs::directory_iterator(folder)) {
diff --git a/src/files/engine_paths.h b/src/files/engine_paths.h
index 7efef2e6..f6d5dd3a 100644
--- a/src/files/engine_paths.h
+++ b/src/files/engine_paths.h
@@ -42,12 +42,15 @@ public:
 
 class ResPaths {
     fs::path mainRoot;
-    std::vector<fs::path> roots;
+    std::vector<std::pair<std::string, fs::path>> roots;
 public:
-    ResPaths(fs::path mainRoot,
-             std::vector<fs::path> roots);
+    ResPaths(
+        fs::path mainRoot,
+        std::vector<std::pair<std::string, fs::path>> roots
+    );
     
     fs::path find(const std::string& filename) const;
+    std::string findRaw(const std::string& filename) const;
     std::vector<fs::path> listdir(const std::string& folder) const;
 
     const fs::path& getMainRoot() const;
diff --git a/src/logic/scripting/lua/libfile.cpp b/src/logic/scripting/lua/libfile.cpp
index 96839aa1..22772874 100644
--- a/src/logic/scripting/lua/libfile.cpp
+++ b/src/logic/scripting/lua/libfile.cpp
@@ -19,25 +19,10 @@ static fs::path resolve_path(lua_State* L, const std::string& path) {
     }
 }
 
-// TODO: move to ResPaths
 static int l_file_find(lua_State* L) {
     std::string path = lua_tostring(L, 1);
-
-    auto& packs = scripting::engine->getContentPacks();
-    for (int i = packs.size()-1; i >= 0; i--) {
-        auto& pack = packs[i];
-        if (fs::exists(pack.folder / fs::path(path))) {
-            lua_pushstring(L, (pack.id+":"+path).c_str());
-            return 1;
-        }
-    }
-    auto resDir = scripting::engine->getResPaths()->getMainRoot();
-    if (fs::exists(resDir / fs::path(path))) {
-        lua_pushstring(L, ("core:"+path).c_str());
-        return 1;
-    }
-    luaL_error(L, "file not found %q", path.c_str());
-    return 0;
+    lua_pushstring(L, scripting::engine->getResPaths()->findRaw(path).c_str());
+    return 1;
 }
 
 static int l_file_resolve(lua_State* L) {