Limit search result to documents only but also exclude folders

Question

I'm using a KeywordQuery within a custom Webpart on a SP2010 farm to aggregate the latest "documents" from the site collection the webpart is running at ("document" = every item stored in a document library except the folders).

Within the QueryString I limit the results to contentclass:STS_ListItem_DocumentLibrary, but folders are still present in the search results.

I’ve tried using IsDocument:1 but then the results are too limited, because there are some file types not registered in the Search Service Application file type pool, e.g. "RTF", "RAR", "PNG", ...

Do I really have to register every file type within the SSA to expand IsDocument or are there other ways to exclude the folders from the results?

Answer 1

To exclude the Folders try adding "Size>0" to your query and see if that helps.