Problem with opening LBK files

Hi! For my class, we have a total of 15 labs that we have to save to the lab book, which we open weekly to add some more to and save again once again when we’re done. This time, the application keeps saying that my file’s “format is not recognized” and won’t open any of the files with LBK in them. I’m afraid to lose any of this work, as we only have 3 more labs left until the semester’s over, and I’ll have to submit all of my lab work at the end. To help, I have a windows computer, and I’ve already restarted my computer to see if the issue persists, and it does.

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