Download Stock Deodex Rom v1.1 in the Development forums.. look through it, it might be towards the end or so..
You can use 7zip to extract files or windows extract .. so if you haven't gotten it, download it at download.com and install it.
Open the v1.1.zip rom, just double click on it, go to SYSTEM folder then APPS folder and search for Quickoffice.apk at the bottom and just drag it out to the desktop.
Now, either copy it through Terminal Emulator by just putting it to the root of sdcard and type
cp /sdcard/Quickoffice.apk /system/app
Or you can use adb, and I bet root explorer aswell as its pretty much all the same concept..
Sent from my HTC Vision