I have a suggestion:All these template become quite difficult to manage, with all these zipped files that people may not see if they do not go to the folder to see what's there I should find a better solution. If somebody has something to suggest...
What if the html template could be a zip file. And the zip file has to include a file called template.html (or template.* would be better). Then when you choose export you simply choose the zip file and all the content of the zip file would then be extracted to the destination folder together with the template.* which contains the actual data.
This way a template writer can include multiple stylesheets, images and even export the data as pure xml (template.xml).

/w