vim: how to extract .vba file to a specific folder

how to extract the vim ball to another folder?
the reason I ask this is, I'm now using pathogen to install all my
previous favorite plugins
but some of them simply don't have a github mirror. and they are only
available in the form of vim ball .vba file:
e.g. http://www.drchip.org/astronaut/vim/index.html#VISINCR

source % will create folders and install them in the .vim folder.
what I wanted is to create a seperate folder (say visinc) under
.vim/bundle/ and put the files under it.
how to do it with .vba file?

thanks.

--
--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php

---
You received this message because you are subscribed to the Google Groups "vim_use" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vim_use+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.