1. Navigate to /System » Library » QuickLook » Office.qlgenerator. Control-click on the generator and pick Show Package Contents from the pop-up menu. Then navigate to Contents. 2. Create a copy of info.plist to use as a backup. 3. Change write permission of info.plist 4. Open info.plist with TextEdit or your favorite text editor. 5. Scroll down to find the following text: <real>800</real> <key>QLSupportsConcurrentRequests</key> <true/> <key>QLThumbnailMinimumSize</key> <real>17</real> </dict> </plist> 6. Replace all of that with this: <real>800</real> <key>QLSupportsConcurrentRequests</key> <true/> <key>QLThumbnailMinimumSize</key> <real>17</real> <key>UTImportedTypeDeclarations</key> <array> <dict> <key>UTTypeConformsTo</key> <array> <string>com.microsoft.powerpoint.ppt</string> </array> <key>UTTypeDescription</key> <string>Full screen PPT file</string> <key>UTTypeIdentifier</key> <string>com.microsoft.powerpoint.ppt</string> <key>UTTypeTagSpecification</key> <dict> <key>public.filename-extension</key> <array> <string>pps</string> </array> </dict> </dict> </array> </dict> </plist> 7. Save the new plist file and quit the editor. 8. Navigate to your user's Library » Preferences folder, and trash com.apple.QuickLookDaemon.plist.
