Install the current UOAI version, then replace UOAI.exe and UOClientDll.dll with the files in the attached archive.
If the window-class-name you specified is correct and if that is the only compatibility problem, it should work correctly.
I recompiled my development version, which is going to change in the next few days... if the attached files solve your problem, I'll upload another recompilation with the specified classname here when i get to releasing the next version.
Edit: After checking
www.uowod.com, I have to say UOAI is not guaranteed to work with your client. I don't speak spanish very well, so not sure if i understood the site correctly, but your server seems to be using a UOLBR-based client, which is relatively old, so not guaranteed that it's supported by UOAI. I don't want to wait for a 250mb download from your servers site, and I only need the "client.exe"; so is there any chance you could add that client.exe to an archive and attach it to a post, PM or mail?
Greetz,
Artaxerxes