Mobile app for hiding... personal files?

[grahamf]

So basically I'm looking for a Windows Mobile replacement for my Runisoft PSP program

Most specifically, I want it to just hide certain videos, photos, and pdf documents from showing up anywhere else in the OS, but still being able to quickly access and open them within the app - preferable with a slideshow feature with the photos, but it's not really a requirement.

Is there such an app? Thanks.