CS6 wont open 170mb file, help needed !

[leemanley]

Having had a look at another thread on here I decided to see what some of my unprocessed dss autosaves contained.
The problem is that when I go into CS6 and try to open the file it decides that it doesnt have enough ram to open the file, so my question is, how can I reduce the size of the image without losing any data ?
I usually align the rgb and boost saturation to 18% then save in DSS, this generally ends up with an image of around 103mb, the autosave I'm trying to open is 170mb, making me think that there is far more data in the untouched version than the other one.
Any help would be really appreiated
Lee

[oldpink]

CS6 can't open the autosave Tif's as far as I know due to the format its saved in

[knobby]

The 16 bit tick box rings a bell?