I did put wnaspi32.dll in the same folder as CDRWIN, and I have the UAC completely disabled, so every program I run has administrator privileges.
CDRWIN doesn't have its own ASPI file in the installation directory, though. After you install, it asks if you want to install the ASPI driver included with CDRWIN. If you say yes, it puts the frogaspi.dll and wnaspi32.dll into your Windows\SysWOW64 directory. Due to the way Windows searches for files, theoretically it should look in the cwd before trying the system directory and the PATH variable...
CDRWIN also has 3 ASPI options: 1) Use the ASPI installed on the system 2) Use the ASPI provided by CDRWIN (presumably the wnaspi32.dll) 3) Use FrogASPI (presumably the frogaspi.dll). Neither of them work on Windows 7, though. CDRWIN detects both my DVD and BD drives for reading with wnaspi32.dll, but it says I have no burners. With FrogASPI, it pops up a warning message saying I'm trying to use an unsupported device when I click on the preferences dialogue, but it still says I have no burners. With your wnaspi32.dll, it says I have no readers and also no burners.