Corrupt skp. file - can anyone help restore file?

Hi, I have been working away all day using Sketchup 8 and Podium SU as I came to save a final version the program crashed. It appears that the automatic save has not operated since this morning and the skb. file will not open (when changed to a skp.).
The same thing happened yesterday and I thought it was a one off so I have lost two days work.
Can anyone un-corrupt this file?

I noticed with SU 7-8, when you use podium and leave the Manager open, it stops the autosaves, and saves sometimes. I think it was a known bug and fixed for later SU versions.
Unfortunately, I don’t know how to help you, just a warning for when leaving Manager open while modelling.