The main advantage at the moment for the docx is that it works similar to a website, i.e. when you put something in a file, it only refers to it: for example, a picture.
If I copy and pasted a picture into an old .doc format word document, the picture was taken apart and stored as part of the file....at the same compression rating as a bitmap: to ensure no loss (Microsoft thinking: don't ask)
As a result the files ended up VERY large and rather slow to load up.
Also, (due to the recognition of this) the majority ofcontent wasn't stored in the file, only a link was made to it.
Alot of people found this out, when they pasted a video into their word document, e-mailed it and the poor receiver got an empty space with "Could not find C:\Doc....\a.avi"
With the new format (I believe - don't quote me

) if you paste a jpeg in, it will store the jpeg in the zipped docx, and then when viewed it will call upon the picture stored: a lot more efficient, and you can permanently attach media to a document.
And the moral of this story?
1. If you want to send video, don't put it in a Word/Powerpoint: that is just stupid
2. If you really wanted to, you should have used Openoffice, who have been using the .xml format as an option for several years now!
hmmmmmm....I could almost submit that as a tutorial....
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