I just got a mark iii + i use bridge to sort through the photos, they're not showing up there + they won't even open in PS5. I'm confused/lost.
The Camera Raw plugin in Photoshop must be continuously updated for each individual camera model released on the market.
Inevitably Adobe is constantly playing catchup with the camera manufacturers and periodically releases an updated version of Camera Raw to capture most of the models released since the last Raw update.
The Canon 5D Mark III Raw files require minimum Camera Raw 7.1
Camera Raw 7 and higher is only compatible with Photoshop CS6 and above.
CS5 is only compatible with the Camera Raw plugin up to Camera Raw version 6.7.
Thus you cannot view Mark III Raw files with CS5 unless you first convert them to DNG.
Your options are: