Sorry for my english, and thanks for this very good program.
If I would export many folders in an HTML file, with option to add content to existing file (to have all content in one file), the result is one HTML file with many headers, body and so on...
OK, its conform to the checkbox, but this file is corrupted.
A file like ("<" and ">" are replaced by "-")
-html-
-head-
-/head-
-body-
-table>Folder 1 content</table-
-table>Folder 2 content</table-
-table>Folder 3 content</table-
......
-table>Folder N content</table-
-/body-
-html-
I just used the shipped html_mp3tag export script on 2 folders with no problems.
Yet, if you want to use one file per folder, then the name of the export file should contain a variable that is unique for that folder like e.g. %artist%_%album%.
I do not think that the options to append a file and create a file per folder go together very well.