When I make a search via FAST directly in the browser, my docx and pptx files appear with a thumbnail image. I can even preview pptx documents in the search page.
However, when I show the search results in an iFrame (the user inputs the query parameters in a page and I get the SharePoint search results using query string parameters), I can see the search results, but no thumbnails, nor preview in browser... This happens in all browsers.
What sorcery is this? The URLs are exactly the same.