.ANI are made by opening up a text editor like note pad and when your saving you would do this. Say its going be named Sex9 you would name it Sex9.ani and it would save as an .ani hope that helps
Also there is a walkthrough in the doc&tools under animated images that might help you its how i learned to make them.
I really AM stupid...I didn't even see that help section
two things:
1. do you have n idea about scripting the girls *to individualize them further* and
2.As thanks, here is the *Advanced* Vocaloid pack, I went to rule34.net and downloaded the pictures I liked from pg1-pg62 (aka ALL pages *thank you*)

and added them to the one from the Active Girls List, which created a *in my opinion* great vocaloid pack.
I added a few characters to it, however, I have not gotten to create a .girlsx file so you might want to create your own stats for them

after all the ramble *which I apologize for* below is the link
P.S. Thanks to your help, there is a sex1.ani of miku in it, enjoy!
http://www.mediafire.com/?2mb72e88j0zg23f