diff --git a/include/LuaAPI.h b/include/LuaAPI.h
index 3444a1a..188cb78 100644
--- a/include/LuaAPI.h
+++ b/include/LuaAPI.h
@@ -32,5 +32,8 @@ namespace FS {
     std::string GetExtension(const std::string& Path);
     std::string GetParentFolder(const std::string& Path);
     bool Exists(const std::string& Path);
+    bool IsDirectory(const std::string& Path);
+    bool IsFile(const std::string& Path);
+    std::string ConcatPaths(sol::variadic_args Args);
 }
 }
diff --git a/src/LuaAPI.cpp b/src/LuaAPI.cpp
index a19049b..46fffe4 100644
--- a/src/LuaAPI.cpp
+++ b/src/LuaAPI.cpp
@@ -321,5 +321,30 @@ std::string LuaAPI::FS::GetExtension(const std::string& Path) {
 }
 
 std::string LuaAPI::FS::GetParentFolder(const std::string& Path) {
-    return fs::relative(Path).parent_path().string();
+    return fs::path(Path).parent_path().string();
+}
+
+bool LuaAPI::FS::IsDirectory(const std::string& Path) {
+    return fs::is_directory(Path);
+}
+
+bool LuaAPI::FS::IsFile(const std::string& Path) {
+    return fs::is_regular_file(Path);
+}
+
+std::string LuaAPI::FS::ConcatPaths(sol::variadic_args Args) {
+    fs::path Path;
+    for (size_t i = 0; i < Args.size(); ++i) {
+        auto Obj = Args[i];
+        if (!Obj.is<std::string>()) {
+            beammp_lua_error("FS.Concat called with non-string argument");
+            return "";
+        }
+        Path += Obj.as<std::string>();
+        if (i < Args.size() - 1 && !Path.empty()) {
+            Path += fs::path::preferred_separator;
+        }
+    }
+    auto Result = Path.lexically_normal().string();
+    return Result;
 }
diff --git a/src/TLuaEngine.cpp b/src/TLuaEngine.cpp
index 8b9cef1..e678f54 100644
--- a/src/TLuaEngine.cpp
+++ b/src/TLuaEngine.cpp
@@ -458,6 +458,9 @@ TLuaEngine::StateThreadData::StateThreadData(const std::string& Name, std::atomi
     FSTable.set_function("GetFilename", &LuaAPI::FS::GetFilename);
     FSTable.set_function("GetExtension", &LuaAPI::FS::GetExtension);
     FSTable.set_function("GetParentFolder", &LuaAPI::FS::GetParentFolder);
+    FSTable.set_function("IsDirectory", &LuaAPI::FS::IsDirectory);
+    FSTable.set_function("IsFile", &LuaAPI::FS::IsFile);
+    FSTable.set_function("ConcatPaths", &LuaAPI::FS::ConcatPaths);
     Start();
 }