Is there possibility to make a command in PD which opens file using another software? I mean for example the patch with bang/open command which opens the picture file or PDF file (and the application opening such files, of course).

have a look at [shell] . Its not working on win32 AFAIK. dunno about OSX?

I`m working on Win, unfortunately... Any other ideas?

http://code.goto10.org/projects/puredyne/

but then the application you want to launch must also be GNU/linux