Andrey Sviyazov,
You wanted to know how to plot received signal under Windows without installing Matlab or something as big and as expensive. Dmitri Stolnikov recommended to use a free version of Signals Analyzer software which should be very powerful. You could download it as "SA free" here: http://signals.radioscanner.ru/info/item1/
Dmitri says that the free version of SA could only import .wav files, so you will need to convert raw files into .wav files. My preferred way to do this is to use 'sox' command line utility like that: sox -r 270833 -e signed -b 16 -c 2 record.cfile record.wav
Windows binaries of 'sox' is available from the official web-site: http://sox.sourceforge.net/