I'm sure I may have tried opening my autosave files in xml format in the past. But as a result, the autosave files are unable to be opened in Construct 2. Or, when I at least try opening the files by opening Construct 2. The problem is, I've opened the files before in Notepad. But now, I can't seem to open them in Construct 2. Is there anything that I need to do to open these files in Construct again? Wouldn't be a point in using autosave if I can't open the autosaves, basically.
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The C2 manual covers how to deal with autosave and backup files here: https://www.scirra.com/manual/61/preferences
"the project can be recovered from the last autosave by renaming the file with the .capx.autosave extension to just .capx and opening it again."
If this doesn't work, then you will need to post a proper bug report ensuring you follow all of the bug report guidelines.