AnyI2C is the tool to test all I2C devices on www.controleverything.com It uses AnyI2CLib which is a basic lib that handle the communication between PC and Bridge X5.
https://github.com/ControlEverythingCom/AnyI2C/raw/master/Bin/AnyI2CSetup.msi
To compile AnyI2C, Microsoft VS2013 Express or higher is needed. The code is written in C#.