Problems with Site Content Type Template using PDF

I am working in MOSS 2007 and am creating new site content types. I have used word documents here and also InfoPath forms. However I also want to use a .pdf file as a template here as well, it is actually the standard government W4 form.

I have created a new Site Content Type in the Site Content Type Gallery, named it W4, set the parent content type to Document Content Type / Form. I have also tested using the Parent Content Type of Special Content Type / Unknown Document Type.Then I go Advanced Settings on my new Site Content Type and Upload a new document template and hit OK. The new template that I upload is the W4 form.I then go to my document library and add a New Content Type from Existing Site Content Types.I select W4 from the list I am given and hit Add and OK. I then go to the Document Library, select from the New drop down list and select W4.

I am then given an warning dialog that states: "New Document" requires a Windows SharePoint Services-compatible application and Microsoft Internet Explorer 6.0 or greater. To add a document to this library, click the "Upload Document" button.

Any help would be greatly appreciated!