Adding a password to a folder

[Goose321]

I need to be able to add a password to a folder for business purposes. Is there anyway to do such a thing? It needs to be able to work across platforms between iOS, Mac OSX, and all versions of windows. Any help would be appreciated.

 

[Alabalcho]

How is this "folder" shared between these platforms? External disk? Shared network folder? Cloud service?

Put your sensitive data into password-protected ZIP file. Or use something like (now defunct) TrueCrypt, which puts data into password-protected "containers".

As for iOS - dunno, I don't consider this "business purposes" use.