My wife always used MarinerWrite to open/edit/save .doc and .docx stuff. But I noticed last week that they were opening in Pages. I think that occurred when I upgraded her MBP to Mountain Lion (which she barely noticed).
The problem is that Pages/Apple assumes you want to convert the .doc to .pages. That means one has to remember to use "Save as...".
EVERY SINGLE TIME THE DOCUMENT IS ReSAVED!!! (I know, but she has been able to finally create the habit of Saving often...

) This thread reminds me to change the default app to open .doc files back to MW! Judy doesn't understand why Pages works that way, and I can't give her a logical reason, anyway.
She has used Google Docs for a shared spreadsheet (that, of course, should have been a database

), but she still grasping that document doesn't live on her hard drive.
