Encrypt in Windows, Unencrypt in Mac?

Hello, 

in that case what you need to do is to download the mac version of the secure access software and you will be able to start and open the encrypted vault on the mac also. so if the files are compatible in both os systems you will be able to open and use them on both computers

here you can download the software for mac

http://kb.sandisk.com/app/answers/detail/a_id/2399/kw/2399