Why exported text ends with a highlighted percent symbol?

Question

I have recently updated Mathematica to 12.1. Whenever I export strings as text now, as in the following MWE:
    Export["test.txt", "a", "Text"]

a highlighted question mark appears at the very end of the underlying txt file:

Then I need to put extra effort to remove. How I can avoid this problem?

Alan · Accepted Answer

To include an eol, try this:
Export["test.txt", "an", "Text"]

One Answer