r under linux: creating high quality bmp's for win users

Hi

I produce graphics with R under linux, but my collaborators often use 
windows and cannot import eps pics e.g. in msword

what is the standard way to get e.g. bmp's with the same quality as eps. 
  going the way: creating eps, convert eps2bmp using 'convert' doesn't 
yield good enough bmp's

thanks for a short hint

cheers
christoph