Multithreading in VB 6.0 to create thumbnails

Hi,

I'm working on a program that makes picture thumbnails. In particular, I'm working with 3 sets of picture that can be activated by pressing the respective button. (so, I have directory A, B, C which contain images).
I would like to create the thumbnails for all the picture contained in a directory but allow the user to interrupt the process and on top of that I don't want the program to freeze when pictures are being loaded.
I'm using the MS Listview control.
In few words, I need some way to create a multithreading application.
Hope that someone can lend me a hand.
Thanks.

Multithreading is not possible in VB6.