hi i have a problem too. GSC utility doesn't good work at Windows 7 Japanese OS.
GSC Utility can't extract some gsc files. so i use GSC Viewer and those files are generated Patch01 with GSC Utility.
but Patch01 is broken file. http://www.speedyshare.com/files/22120603/patch01.gs1
Could you give me advice how to clear for this problem.
I tried opening the patch in above link, I seem to experience the same problem as you. I can't tell wether it is a problem with the japanese version of Windows 7 or with the japanese version of patch01.gs1. For me the patch01.gs1 on Windows 7 does not give me a problem.
I'm inclined to think that Windows 7 is not the problem, but rather the inability of these decrypting tools to handle Japanese characters. (Is your cossacks game in Japanese or another language?)
I'v tried various ways known to me to bypass problems like this ( including renaming the file to open it with gsc viewer) and neither of these methods has worked for me.
The only thing that worked was right-clicking on the .gs1 file and "open with" notepad / wordpad. Then it opens the content of the patch, however this is a bit a confusing method to work, because it, well try it out and you will see why. It doesn't work very handy from a modding perspective since it lists all the files in one text file
The only thing I can do at this point, is add this issue to my ' to ask' list for GSC Game World and see what they think about it.