- String ext(String(filename.begin()+filename.find_last_of('.')+1,filename.end()));
- if(ext!="sif" && ext!="sifz" && !App::dialog_yes_no(_("Unknown extension"),
+ String ext(filename_extension(filename));
+ if(ext!=".sif" && ext!=".sifz" && !App::dialog_yes_no(_("Unknown extension"),