complete milestone 1

designer/src/desktop_file_interface.cpp

@@ -1,6 +1,7 @@
 // D:\Dev\Mosis\MosisService\designer\src\desktop_file_interface.cpp
 #include "desktop_file_interface.h"
 #include <cstdio>
+#include <cctype>
 #include <filesystem>
 
 namespace fs = std::filesystem;
@@ -16,12 +17,20 @@ void DesktopFileInterface::SetAssetsPath(const std::string& path) {
 }
 
 std::string DesktopFileInterface::ResolvePath(const std::string& path) const {
+    std::string resolved = path;
+
+    // Handle URL-encoded Windows drive letters (D| -> D:)
+    // RmlUi sometimes encodes the colon in Windows paths
+    if (resolved.size() >= 2 && std::isalpha(resolved[0]) && resolved[1] == '|') {
+        resolved[1] = ':';
+    }
+
     // If path is absolute, use it directly
-    if (fs::path(path).is_absolute()) {
-        return path;
+    if (fs::path(resolved).is_absolute()) {
+        return resolved;
     }
     // Otherwise, prepend assets path
-    return m_assets_path + path;
+    return m_assets_path + resolved;
 }
 
 Rml::FileHandle DesktopFileInterface::Open(const Rml::String& path) {