PowerPoint Show (*.pps) file copies as a PowerPoint (.ppt) file when downloaded from the internet

Today we had a probelm on our website, where when you try to download a PowerPoint Show (.pps) file, the file was downloading as a PowerPoint Presentation (.ppt) file instead of a .pps file.

I have done some research on google and found the following solution to my problem.

• In IIS Administrative Console snap-in, right-click the specific Web server where the .pps file is located, and then click Properties.
• Click the HTTP Headers tab.
• Click on Mime Types button in IIS 6.0
• Click the File Types button in older versions of IIS.
• Click New Type.
• In the Extension box, type .pps, and then in the Content type (MIME) box, type application/vnd.ms-pps.
• Click OK, and then restart IIS.

To know more click on the link from Microsoft