As I've already stated in title.
I can't get Ark to unrar broken up files correctly, and that's on of most useful features of rar as it gives you easy way to save big files in more smaller files instead...
Anyway anyone knows is this planned and if it is or if it's even implemented as i thought why it isn't working correctly??

it's working fine with me, all I had to do is install the rar and unrar packages, never tried to split the archives myself but I unrar these pretty often.

Update: to unrar split archives I open the part1 with ark and unrar it like if it was a normal archive, same as winrar, it detects the other parts and unpack it properly.