https://github.com/fifengine/fifengine/issues/1085

Index: engine/core/loaders/native/map/objectloader.cpp
--- engine/core/loaders/native/map/objectloader.cpp.orig
+++ engine/core/loaders/native/map/objectloader.cpp
@@ -702,7 +702,9 @@ namespace FIFE {
 			for (iter = files.begin(); iter != files.end(); ++iter) {
 				// TODO - vtchill - may need a way to allow clients to load things other
 				// than .xml and .zip files
-				std::string ext = bfs::extension(*iter);
+				bfs::path p = *iter;
+				std::string ext = p.extension().string();
+
 				if (ext == ".xml" || ext == ".zip") {
 					loadImportFile(*iter, importDirectoryString);
 				}
