if (valid_image_file (path)) {
single.reset (new ImageContent(path));
- } else if (ext == ".srt" || ext == ".ssa" || ext == ".ass") {
+ } else if (ext == ".srt" || ext == ".ssa" || ext == ".ass" || ext == ".stl") {
single.reset (new StringTextFileContent(path));
} else if (ext == ".xml") {
cxml::Document doc;