So, after hunting and hunting for an elusive VC6 version of php_oauth.dll I eventually found one! YAY
Can you PLEASE PLEASE PLEASE include this with the next build. It was a bit of an ar$e to find.
1. So download it.
2. Put it in the php/ext dir.
3. Add extension=php_oauth.dll into the php.ini (at the bottom of the others that are listed in there)
Restart Apache. Bingo! Working.