YELLING in "caps" on this forum won't help...
This is a "customer-to-customer" forum, and while DH staff occasionally checks in, it's not something you can count on. If you feel that your file is being cached, you should submit a support ticket via the control panel to bring the matter to Dreamhost's attention.
Also a "tip" on "caching": That file may be cached at any of several places along normal internet routing, and it may* or may not* be the result of anything DH is doing.
You might try deleting the file from your ftp space, then browsing to it and getting a "not found" before re-uploading the file with your ftp client. This sometimes "works" to cause a "refresh".
FYI, the version of the file displayed to my browser is dated 17-Nov-2006 23:05, and shows as being 348K in size.