Locked file in 5.5

I am running Adobe CAptivate 5.5 with windows. My computer froze when compressing and saving a file. I had to choose the End Now" option and now I  cannot open the file. I have read about the dCache zip file but I cannot download the .AIR file extension opener due to IT restrictions. I have gone through project preferences and emptied that cache but this has not helped. I am open to suggestions!