When downloading a PDF file from an information database, a .TMP extension is assigned to the file. In IE9, I cannot choose "Open" because the file type is unknown. In IE8, I can choose "Open" because in shows that (even though it is a TMP file), it is a file that is supposed to open with Adobe Reader.
In IE9, I can choose "Save As..." and put in the .PDF extension, but this is not a sufficient work around, as this is going to grow into a bigger problem.
NOTE: the version of Adobe does not seem to have any affect (Acrobat 7, Reader 9, Reader X).
How can get IE9 to interpret the TMPs from this database the way IE8 interprets them?