You need to set up the MIME types correctly on the server so it knows what to do with the files. Here they are:
.application --> application/x-ms-application
.manifest --> application/x-ms-application
.deploy --> application/octet stream
If you are targeting the .Net 3.5 Framework, you also need these MIME types:
.msp --> application/microsoftpatch
.msu --> application/microsoftupdate
And if you have a VSTO application, you need this one as well:
.vsto --> application/x-ms-vsto
RobinS.
GoldMail.com
RobinS.
GoldMail.com