If you search online for résumé envelopes you will see that manufacturers of these products accent both e's in their products. From the discussion in this thread, you can see that there are mixed thoughts on how to accent e's in résumé; however, it is doubtful that any of the three spellings will be the reason you do not get an interview. At the end of the day though, I prefer to accent both e's to demonstrate my proficiency with Word and I think others should as well if they are listing MS Word as a skill set on their résumé.