I should put a link from page 177 to page 35 on plug-in installation. There it gives the Premiere Pro app path you’re looking for:
Presets and editing mode XML files are loaded from the application-specific folders, not from the
common location. On Windows, the root path for Premiere Pro is in the registry at
Adobe Premiere Pro.exe. Then, just add the proper subdirectories.
For sequence presets:
\Settings\SequencePresets\[Your specific folder]\
Sequence preview presets:
\Settings\EncoderPresets\SequencePreview\[Your editing mode GUID]\
\MediaIO\systempresets\[Your exporter folder]\
Unfortunately there’s no Media Encoder app path given. I’ll log a bug if you’re interested.
However, now that the AME team has added the new Preset Browser for CS6, that info on installing the presets in a separate location for each app for better performance may no longer be relevant. Installing to the shared location here…
might be fine and quite a bit easier.
That App Path Registry Key doesn't really help since you can't install, as you say, to the AME MedioIO too.
I'll use the User Key for now since I can detect CS4.0, 5.0, 5.5 & 6.0 and give options as to whether you want the plugin installed in each version you currently have installed.
please add a bug incident requesting registry keys for all the installation locations - and as noted previouly, not just for the current version - because LOTS of people use version x and x-1.