Flat file url directory

Is there any website or directory where we can access the category flat files?

I have found several urls to flat files in google but any of them leads me to any list where all the flat files are available by downloadable url. I know you can do this through Seller Central, downloading the specific one for every category but I am working with thousands of products from different categories and doing it manually through Seller Central is not efficient.

Any help?

Thanks in advance