VST2
is now an older version of the Virtual Studio Technology (VST) format for audio plug-ins:
What it is
VST2 is a type of audio plug-in software interface that allows users to integrate virtual instruments and effect modules into their DAW.
History
VST2 was introduced in 1999 by Steinberg, the company behind Cubase. It was the popular standard for many years and is still widely supported by various DAWs and audio software.
File extension
VST2 plugins have a file extension of .dll.
Compatibility
VST2 plugins are compatible with almost any program that requires audio editing, including video editors.
Installation location
VST2 files are usually installed in the Program Files folder under a VstPlugins folder.