I have downloaded a file that ends in the extension .ny, which I assume from the context is a Nyquist plugin. I haven’t been able to find how to use it. Can anybody help?
Win 7 Home Premium SP1
Audacity 2.0.6
Wouldn’t you just dump that into the /Audacity/plugins folder and restart Audacity?
I’m not a Windows elf, but it’s supposed to be that easy. It may not be easy to find it after you do that. It may not show up with the same effects name as the filename. It will be a name near the bottom of the effects list that didn’t used to be there.
Koz
Nyquist files are written as “plain text” files. You can examine the contents by opening the file in a plain text editor (such as NotePad), though you should take care not to modify the file unless you know what you are doing 
Instructions for installing Nyquist plugins are here: http://wiki.audacityteam.org/wiki/Download_Nyquist_Plugins#install
Lots of other information about Nyquist plugins here: http://wiki.audacityteam.org/wiki/Nyquist_Plug-ins_Reference
Also, we have a section on this forum specifically about using Nyquist, so if you are interested in learning more about Nyquist and have questions, then that is the best place to ask: http://forum.audacityteam.org/viewforum.php?f=39