Hi @ all 
i just downloaded 'http://arduino.cc/en/uploads/Main/arduino-mega2560_R3-reference-design.zip' with firefox.
and with totalcomander it was all fine to unzip it. the files unzipped are also fine.
Sizes:
161,8k arduino-mega2560_R3-reference-design.zip
294,2k Arduino_MEGA_2560-Rev3.brd
1,2M Arduino_MEGA_2560-Rev3.sch
sunny greetings
Stefan
PS: @Moderator : its possible to merge this topic with http://arduino.cc/forum/index.php/topic,98942.0.html ?