I just downloaded and compiled the following example extensions project :
https://github.com/elanhickler/MyReaperPlugin
I put the compiled binary in the following folder
C:\Program Files\REAPER (x64)\Plugins
Now how the heck do I open it, or see what other extensions/reaper plugins are installed? I searched the manual, etc, and for the life of me I cant figure it out! Theres not a lot of documentation surrounding all of this....
EDIT: I think I figured it out....by reading the source code of the plugin. Doh. I guess It just creates some actions? But my question still kinda stands. Like I know I have a ReaScript installed that opens up the Circle of Fifths, but is there no way to see a list of all extensions anywhere?!