title: RmD files corrupted in one git subdirectory
body: <p>In opening some R Markdown Files (RmD) that I last worked on ~8 months ago, all the files of that type in one git subdirectory seem <a href="https://i.stack.imgur.com/7mkVo.png" rel="nofollow noreferrer">corrupted</a>. It's the same problem whether I try to open in R Studio or TextEdit, and across multiple computers (all Mac though). The problem does not affect other RmD files in other subdirectories, or other file types in the same subdirectory. I've tried all the "Reopen with encoding" options in R Studio, but that doesn't seem to be the problem. I read <a href="https://stackoverflow.com/questions/27970101/rstudio-r-file-corruption">this</a> thread, but it doesn't seem to address my problem. Any ideas on how I might be able to open these files to edit them, and how can I avoid this kind of problem in the future?</p>