volgens Guillermo Madero S..
Hi George,
How are you uploading the files, through Moodle or via FTP to a repository? FTP has to be set to binary mode when doing transfers. If you download (right click and save as...) a document and compare it with the original, do you actually have any differences? Did you (or anyone else) change anything at all at the web server configuration file? Could it be a MIME setting issue? Have you checked for virus?
By the way, it is best to avoid all-caps texts.