I set up an Announcements module for one of my users so that she could post announcements with a WMV file associated with each one.  However, when she tried to upload a WMV file, she saw this message:

File type wmv is not valid in this context. Valid File Types Include: jpg,jpeg,jpe,gif,bmp,png,swf

Here are the exact steps my user performed to produce this error:

1. Clicked "Add New Announcement."
2. Entered a title and description for the item.
3. Selected Link: / Link Type: / File
4. Selected a file location and clicked "Upload New File."
5. Located the WMV file on her computer and clicked "Upload Selected File."

When I logged on as host, the Announcements module allowed me to upload the WMV files using this process.  So I assume that there is some difference in permissions between the Host account and my user's account.

But this restriction is being enforced by the Announcements module itself.  My user is able to upload using the standard DNN text editing methods.  In other words, she can highlight some text in an announcement, click the "Insert/Edit Link" button, click "Browse Server" and from there upload any type of file she needs to.

I would prefer that my user be able to add her WMV files using the first method, because it's easier for her and more structured, but it's not clear how I can remove the restriction on file types.