How do I do a mass download of all files?

Create a report that displays the URL of all the file attachments and use the FireFox extension

DownThemAll

https://addons.mozilla.org/en-US/firefox/addon/downthemall/

Use this form of the File URL to preserve the file name and extension:

https://quickbase.com/up/bdb5rjd6g/g/rz/ey/va/Model_T.jpg

See:

http://www.quickbase.com/api-guide/index.html#filemanagement.html