The file belongs to a suite of tools developed by Team SolidSQUAD to enable "local activation" of SolidWorks products without a valid purchased license. These tools typically work by modifying system registry keys, installing unofficial licensing services, and blocking the software's ability to "phone home" to Dassault Systèmes' activation servers.
The "SW2010-2012.Activator.SSQ.exe" file can spread through various means, including: SW2010-2012.Activator.SSQ.exe