.gsd files

Hello,
I am attempting to open a large file and am having problems. I received the file as two separate .iso files. I was advised to split these files into smaller chunks that could be saved onto multiple cd's. I used a program called gsplit to do this. I now have the original two .iso files and the split out files, which are .gsd files. I don't know what to do next in order to run the file. If it matters, the file is a game. I appreciate any help you can offer. Thanks!

 

Thank you for responding so quickly! My question is: Was it necessary for me to split the files if I already had the .iso files? If I "unite" them, won't it just give me what I already started with? Thanks!

 

I have followed the instructions on the gsplit website and re-united the files. As expected, I'm left with the same two .iso files I started with. I don't know what I need to do to convert these to executable files. Thanks in advance.