Thanks for the help Abhilash! Apologies for being unclear. It has been made known to me that the version in question is actually "SAP Crystal Reports runtime engine for .Net Framework (32-bit)" the specific version being 13.0.5.891
Edit: For the version mentioned above it is:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\SAP BusinessObjects\Crystal Reports for .NET Framework 4.0\Crystal Reports\Database\ODBC