Fix #6141: CSS50.dat is never loaded (#7357)

distribution/changelog.txt

@@ -10,6 +10,7 @@
 - Fix: [#3596] Saving parks, landscapes and tracks with a period in the filenames don't get their extension.
 - Fix: [#5210] Default system dialog not accessible from saving landscape window.
 - Fix: [#6134] Scenarios incorrectly categorised when using Polish version of RCT2.
+- Fix: [#6141] CSS50.dat is never loaded.
 - Fix: [#7176] Mechanics sometimes fall down from rides.
 - Fix: [#7303] Visual glitch with virtual floor near map edges.
 - Fix: [#7327] Abstract scenery and stations don't get fully See-Through when hiding them (original bug).

src/openrct2/Context.cpp

@@ -273,10 +273,18 @@ namespace OpenRCT2
 
             std::string result;
             if (pathId == PATH_ID_CSS50)
+            {
+                if (!(_env->GetDirectoryPath(DIRBASE::RCT1).empty()))
                 {
                     auto dataPath = _env->GetDirectoryPath(DIRBASE::RCT1, DIRID::DATA);
                     result = Path::Combine(dataPath, "css17.dat");
                 }
+                else
+                {
+                    auto dataPath = _env->GetDirectoryPath(DIRBASE::RCT2, DIRID::DATA);
+                    result = Path::Combine(dataPath, "css50.dat");
+                }
+            }
             else if (pathId >= 0 && pathId < PATH_ID_END)
             {
                 auto fileName = LegacyFileNames[pathId];