* harbour/source/rtl/set.c
! do not add .prn extension to printer/extra filenames if file name
is one of well known device name: PRN, LPT[1-3], COM[1-9]
This code is enabled only for OS2 builds where it's necessary
but maybe MS-Windows/DOS users should think about adding it to
their builds too because sometimes also DOS/Win does not recognize
correctly device name when it has extension.
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