In text file C:\Users[UserName]\AppData\Roaming\Steinberg\WaveLab 7\Cache\plugins.set
You can see all the plugin files that WaveLab evaluates.
If a file is recognized as a plugin, you will see “PlugIn=1”
else “PlugIn=0”
In that last case, that means somehow the plugin is not a plugin, or has a problem with WaveLab.