Block file access across the platforms

I use Rhino 5 for mac. I use dropbox to store and archive files that have blocks in them. Will Rhino on a Windows platform be able to be read and manipulate files that were created on a Mac platform that have linked rhino files in them and will Rhino on a Mac platform be able to read and manipulate files that were created on a Windows platform that have linked Rhino files in them?

In principle yes. However, you will need to screen for V6 files as Rhino V5 (Mac or PC) cannot read the current version V6 files.