md5sum issues

On Tue, 2 Feb 2021 17:01:05 +0100

This happens to all text-based files (Rmd, MD, CSV...) but not to 
non-editable files (PDF, XLSX...).

This is probably caused by Git helpfully converting text files from LF
(0x10) line endings to CR LF (0x13 0x10) when checking out the
repository clone on Windows (and back when checking in).

This configuration option is described in Pro Git:
https://git-scm.com/book/en/v2/Customizing-Git-Git-Configuration#_core_autocrlf

Best regards,
Ivan