Hi Patricia,

You can exclude CMS.File document type from SQL search by adding it into "Settings -> Web site -> Exclude document types from SQL search" field. If you use smart search you could exclude it from appropriate index. You can specify layout of search results in transformation that you have set into 'TransformationName' property of 'cmscompletesearchdialog' web part.

Best Regards,

Martin Dobsicek