When transferring files from a Mac to a MassTransit server using Firefox's built-in HTTP file transfer support (without the MassTransit Plug-in), you will be able to select two file types that cannot actually be transferred using HTTP. The affected types (.app and .pkg files) are considered "bundles" or "packages" on Mac OS X. They normally look like a single file but are essentially folders containing multiple related files.
You are reporting a typo in the following text:
Simply click the "Send typo report" button to complete the report. You can also include a comment.