what I have heard so far seems to be related to the "pro" version of WB6.
You are correct
is there a way to insert an avi file for the "please wait" animation without having the "pro" version???
No it actually will only use 1 file type called .nwa SKS ^ has the only .NWA compressor there is since it was a special file type built just for windowblinds!
However to try and help if you will build the animation like shown in the link I posted for voidcore I will compress it for you and tell you how to manually insert the code!