Sorry to hear that. Given your previous comment that the file might be badly corrupted the following might not be much use, but if your file is absolutely vital to you then anything's worth a shot. Create another powerpoint file of similar size and content, save it and open it in a hex editor. Then open your broken one in a second instance of the editor, position the windows side by side and start comparing. Since it won't open at all there's a fair chance the corruption is in the file structure or header information near the beginning or end rather than the content, and with a bit of effort and persistance and a good file to compare against you might be able to get some of it back. At the very least you should be able to see your text in there and copy it out into wordpad or something. If the text is all you want, just rename the dead file to a.txt and open it in wordpad.
I can't think of anything else...
