The is a portal. Instead of your DAW loading 100 separate files for 100 different plugins, it loads this one "WaveShell" file, which then manages the entire Waves catalog installed on your system. The "10.0" signifies the version (Version 10), and "x64" indicates it is built for 64-bit operating systems. Common Locations for the File

WaveShell1-VST3 10.0_x64.vst3 is a "gateway" file used by Waves Audio

The most common question regarding the is: "I installed Gold Bundle, but my DAW only shows 'Waveshell' – where is my SSL Compressor?"