I figure it out myself already, but thank anyway.
I found this software - it can be downloaded from official site. here is the link
http://www.graphteccorp.com/craftrobo/support/OPS656V120.ZIP
Amazyan,
Archive "robo.zip" contains 8 GSD files and 1 PDF.
PDF is manual showing how to assembe tachikoma, so GSD files must contain parts.
Google tell me that GSD file is Professional Draw Vector Graphics. I tried to find this software but without success. Then i tried to open this files...