The menu item "File" -> "Save Objects To" (indirectly) uses LoadWidget::saveFile() to save all objects. However, LoadWidget::saveFile() has a crude and severely broken ad-hoc implementation to check whether the path picked in the save dialog contains a filename with an extension: filename.contains(".",Qt::CaseSensitive) Note: filename contains the entire path here.

If the filename does not contain a dot but another component of the path does, this check returns a false positive, causing the file type detection to wreck havoc.