how to unpack/join 2files: file.sitx.001 and file.sitx.002

[cudo]

hi, i got these two files which are to make one big file but how can i unpack them join them together. when i use stuffit 12 it gives me an error "unknown format" what am i doing wrong ?

cheers

 

[cudo]

answer is here if needed:

http://www.mechodownload.com/forum/...ack-join-mac-software-general-guidelines.html

thanks to all people who helped