Memsource has been created to work directly on the Editor, and specially online.
However, the cat tool provides an alternative for those translators who still haven´t downloaded the program and then, you can export the same content, into a bilingual MS Word file.
The huge disadvantage about working this way, is that you don´t have access to the TM or the TB (Translation Memory or Termbase, respectively).
What we did find very useful about this bilingual doc, is that once you have done your translation in the Editor, you can download this bilingual doc, to run the spellcheck here in the doc, as simply as you do it when you work on any MS Word file.
You don´t even have to hide the source language, the spellcheck will only take the target column, and just will ignore the source column:
Bilingual doc exported from Memsource.GIF