Can't access Lulu author file download, word opens and corrupts. Says it will open in firefox. It won't

I tried to review my novel download from Lulu.com. cHANGING lEAF mOON BOOK 6. i SEE Options, to open it in MS, Google, Foxfire. I chose foxfire which is my default after I got rid of EDGE. Now download will open, BUT pdf file goes automatically to word, AND i CAN'T OPEN IT ANY OTHER WAY, and word corrupts the PDF file, format gone, chapter titles gone, no pages pictures etc. I have a physical BOOK copy so it is not the publishing company. It is the file conversion from WORD, tRYING TO OPEN MY PDF FILE I uploaded to Lulu. the Word CONVERSION program changes Lulu's PDF and creates a mess so I can not proof my final book without a messed up format, words dropped, etc. What is is keeping me from using Foxfire to open my programs even though I have Foxfire as a default browser. Help