Atmel Studio 7

ATmega48PB/88PB/168PB is supported in the latest version of Atmel Studio 7 - a Free IDE for development of C/C++ and assembler code for Atmel microcontrollers.

Studio 4 does not support ATmega48PB/88PB/168PB.

Go to http://www.microchip.com/development-tools/atmel-studio-7 for the latest installer and user guide, and other relevant information.