W
WM
Yes.
If you create a text file containing simply the name without the
extent, many text-editors, word-processors, spreadsheets,
databases will helpfully drop line- or field-terminal spaces for
you. In your case, any attempt to reconstruct such a full
filename by simply re-adding the extent would fail.
I was thinking of something like this being a problem. So far it
seems not to happen but I can imagine that sometimes that trailing
blank will get "corrected out" while using copy and paste.
Then I will have a file name reference which is incorrect.