SCP .vmdk file from ESX 2.5 to ESX 3.5

Hi, I have to SCP a .vmdk file from Esx 2.5 to a ESX 3.5 machine and use it as a storage for a new VM on the 3.5 ESX host. I can't use VI to copy it.

Now when I try to attach the .vmdk to the 3.5 VM, it  prompt a Error " A vlaue exceeded the acceptable range"

How can I upgrade the 2.5 .vmdk to 3.5 without VC? Any ideas?

Thanks