NSPrincipalClass NSApplication CFBundleIconFile fstl.icns CFBundlePackageType APPL CFBundleGetInfoString A minimal fast STL viewer CFBundleExecutable fstl CFBundleIdentifier com.impraxical.fstl CFBundleDocumentTypes CFBundleTypeExtensions stl CFBundleTypeName Stereolithography file CFBundleTypeRole Viewer