Ah, ok. A tip, if you have to use Windows editors, is to use notepad. It can deal with (open, edit, and save) files containing UNIX line-ends, although creating a new file always uses DOS line-ends.

On the tablet, you ought to get a real text editor; for me, that means JOE, but nano is said to be a viable option. Or stick with vi, if you like it, but other options are available.