UltraARC for Inno Setup (Conversion Tool)

[mamed3000]

Hi
I split my game to 3 part! (data1a.cab , data1b.cab , data1c.cab)
your "Black_Box_ultraarc" installer will merge these 3 part to one part at Drive C {tmp}
I don't Want this to happen. I want to Merge these 3 part at {app}
so:
I changed "records.ini" and replaced {tmp} to {app}
the problem :
creating of new folder of {app} is after merging. so there is no {app} directory and merging will faild.
I want the installer to create that {app} directory automatically before merging.(if i create it Manually,it will work fine)
could u help me?
tnx