plugins.file.showFileOpenDialog(selectionMode,startDirectory,multiselect,filter,callbackfunction,title) has a lot of options, but is there a way to pre-set a file name, when you want to suggest a file name for a new file?
That would be handy in the common scenario where users need to create a file name for Excel export, and we want to suggest a temporary file name that contains the subject, the date and the time including seconds, so that the user gets unique file names for his exports.