Dnloading FDF docs / acrobat integration

Greetings! I am currently working on a project that creates an FDF document on-the-fly. The end user should beable to click on a link (something like http://whatever.com/mydoc.html?<SID here>) and download an FDF document. Users who have acrobat reader installed (with the browser plugin) should beable to simply click on the link, and reader will open, displaying the proper pdf with the fields filled in The problem is: When a user clicks on the link, the fdf document either 1) is displayed in plain text (despite the proper header being sent) or 2) acrobat reader opens but displays an error saying the file can not be found. I can right click on the link, and choose to save to disk. Once I have the fdf document on disk, opening it will propely open its associated pdf and fill in the fields. Has any one had this type of problem before? could web cacheing be causing this? could php sessions be influencing this? Please CC me your reply (pshafer@netsolutionsllc.com) as I am not on this list. Thanks. -Patrick Shafer