Even if you don't want to save 2D copies of 3D photos on your HTC EVO 3D, you can still view 3D photos and videos in 2D.
- Launch the Gallery app and select the 3D photo or 3D video you want to see in 2D.
- Tap the photo or video to bring up the on-screen controls.
- Tap the 3D cube in the top right corner. The photo or video is instantly viewable in 2D.
- To see the content in 3D again, tap what has become the 2D cube in the top right corner.
HTC's Gallery is currently the only app that offers such seamless 2D/3D switching.