Mozilla Recovery Key is an executable file?

Hello, On March 1, I worked with the Mozilla help team to create a recovery key. Now that I need it, it says it is an MS Dos executable file, and that I can't run that file on my computer. I have tried a few workarounds from google, but really I just need my recovery key. I thought maybe this was because wordpress is no longer available on Windows PCs but I can't open it in word either, it just keeps saying it's an MS Dos executable file. I really need the recovery key because I can't access anything on one of my computers. Can you assist? Thank you Frances