@Danick
I did notice the thread because of the title but tagging works far better.
If you think about how IMEX data tasks work or look at the example XML in the article on my website...
Use to view & modify saved import/export XML data tasks
www.isladogs.co.uk
...you will realise the tasks are designed to work with one file at a time.
You can edit the file path using my code but you can't import two files on one task
You could probably write a procedure or even a macro to do two tasks in sequence if its something you need to do regularly.