editing dos 737 character set on visual studio 2012


I am a new user in visual cobol 2012 and I am trying to edit some of my old micro focus 3.2.43 programs and data files that are about 20 years old and use 737 greek character set (ascii), but everything writen in greek is not displayed correctly.  What I would like to know is if it is possible to keep working with the existing character set without converting as to keep both old and new programs working together with the same data files.

Thank you in advance