I started working with AT90USB1287 some weeks ago, using AVR STK 501. I've made some additional connections to have possibility using USB channel. I've made own software for the AVR device and Win XP, based on the Atmel example (HID) using AtUsbHid.dll. Everithing is working, but the driver generates file "debug-fifo.txt" when the Atmel device sending some data. I tried with MVC++ and with the Borland C++Builder but results are the same. Is anybody knows how to switch off the ganaration of the "debug-fifo.txt" file? Thanks in advance.