Now decide which file type you want to add. It could be a Photoshop .psd file extension or it could be any other one. If you want to build a new PSD file, the extension would be .psd.

The free doctape Viewer iOS app lets you open more than 80 different file types using an iPhone, iPad, or iPod touch. The app is very useful, but CIO.com blogger James A. Martin found a few drawbacks.