Mauloop,
Thanks so much for Sharing back to the community. Using templates to create the content one wants to save is a key pattern in TiddlyWiki.
When people learn how to do this and build their own exporters I believe they are greatly empowered.
Something I discovered recently is, if you craft a tiddler to look exactly as you would want it to save, you can open that tiddler in New Window, use the browsers print and print to a Generic/text file printer.
Then rename the filename to save to the required extension and print.
This is a quick way of exporting something and not being restricted to registered file types.
Regards
Tony