I've been working in the file for a week now. I usually leave it on my laptop, just close the cover and reopen it the next day, adding to the file everyday. Like I said before, I have win xp, but this client's file was in the latest word (extension docx). This morning, I worked on it, saved regularly as I always do, and then just like that, word disappeared. When I relaunched it, no recovered file. I looked in the folder where I saved it: nothing. Just a few files with this sign (~) before their name. One might be the one that disappeared, it's a tmp. Otherwise, I found some wbx and/or asd or tmp files in the backup destination (in Appl Data/Microsoft/Word.