Question bup slim bk files not showing in file explorer

[ACPAXD]

I use this external hard drive for my Mac and backed up all of my files on it. I'm trying to get all of my teaching files off of this external hard drive. The files show up perfectly fine when I plug it into my Mac (I use it for my Time Machine backup) but when I try to open it on my desktop PC (Asus with Windows 8.1) the files don't show up. I'm not super tech savvy so I apologize in advance if it's a no-brainer question.

 

[popatim]

The File system used by a Mac formatted drive is not compatible with Windows.
If you wish to have the drive work on both OS's then reformat it as ExFat and reload your files back on it.