I don't recall what Windows version I was using at the time I saved my file, it was Dec 2011 right before my computer died. Probably Widnows 7, it wasn't that old of a computer. The file is saved on a DVD-RW. I use Windows 7 on my new computer.
Is there any hope to retrieve it? The link you provided gave me info on how to convert a read only file. This doesn't seem to apply to my situation. The read only file box under properties is not checked on this file when I looked.