Common: Update path browser extension handling.

Common/File/PathBrowser.cpp

@@ -101,20 +101,20 @@ std::vector<File::FileInfo> ApplyFilter(std::vector<File::FileInfo> files, const
 		std::string tmp;
 		while (*filter) {
 			if (*filter == ':') {
-				filters.insert(std::move(tmp));
+				filters.insert("." + tmp);
 			} else {
 				tmp.push_back(*filter);
 			}
 			filter++;
 		}
 		if (!tmp.empty())
-			filters.insert(std::move(tmp));
+			filters.insert("." + tmp);
 	}
 
 	auto pred = [&](const File::FileInfo &info) {
 		if (info.isDirectory || !filter)
 			return false;
-		std::string ext = File::GetFileExtension(info.fullName);
+		std::string ext = "." + File::GetFileExtension(info.fullName);
 		return filters.find(ext) == filters.end();
 	};
 	files.erase(std::remove_if(files.begin(), files.end(), pred), files.end());