I just did something I thought was obvious in AS5 but it wouldn't let me. I started a new avr-gcc executable project so it created a .c file for me. I then wanted to add a .S file to the project so I use File-New File.. but under "avr-gcc" it only offers to create .c or .h files. What the hell happened to .S ??
And no "AVR assembler" is not an option here (though it could well confuse a beginner) because that's talking about .asm files clearly for Atmel Assembler2, not avr-as.