I’ve been trying to add a custom refiner to my FAST Search Centre that allows refinement by Content Type.
After a quick search I found this article, Refining on Content Type in SharePoint 2010, however I know a means of allowing the built-in Content Type managed property to be used as a refiner
Add-PSSnapin Microsoft.SharePoint.PowerShell
Add-PSSnapin Microsoft.FASTSearch.PowerShell
Start-SPAssignment -Global
$managedPropertyName = 'Content Type'
$managedProperty = Get-FASTSearchMetadataManagedProperty -Name $managedPropertyName
if($managedProperty -ne $null)
{
Set-FASTSearchMetadataManagedProperty -Name $managedPropertyName -RefinementEnabled $true
}
Stop-SPAssignment -Global
Remove-PsSnapin Microsoft.SharePoint.PowerShell
Remove-PSSnapin Microsoft.FASTSearch.PowerShell
So after running that, kicking off a full Crawl and then editing the Refiner Web Part as outlined in the Adding Search Refiners in SharePoint 2010 to add a refiner option for Content Type I was able to see refinement options based off the Content Type.
Great…. But there’s a catch….
The refiner appears to be only giving me the underlying MIME Type 
To get a useful refiner based on the SharePoint Content Type, I used the method outlined by Glyn in his article: Create a content type search refinement panel in SharePoint 2010
Gav's Blog - Tech Adventures 
Hello Gavin. Not the problem I have, but nice to see your blogs hitting my search results 🙂
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Hi, appreciate this is old, but when i create a custom mapping i still get what looks like the mime type. Any ideas?
Hi, i setup a custom mapped property but i still get the underlying mime type. Any ideas?
Hi, as I mentioned in this post using the method I outline just gives you the MIME type. You need to follow the instructions given by Glyn in the article linked at the end of the post.
HTH
-Gavin
Hi Gavin, yes i followed that, created a new property, mapped it to ows_contenttype and basic:5 but it still exposing the MIME type
Hrmmm, you have your mappedpropery attribute set to the correct managedproperty and you’ve run a full crawl?
I’d suggest only having the refiner you’re interest in the list of ‘categories’ in the xml for the refiner panel.
Edit: you have set the managed property to “Include values from all crawled properties mapped”?
Hi Gavin. Yes, its set to include all. Its basically as it was in our 2007 environment, but we now us 2010. Thankfully we have premier support so ive raised a ticket. If its an interesting result i will leave a comment if i remember. good article though. Thanks