Is there a flag/property to identify custom content types?

Question

Is there a flag / property to identify custom content types in SharePoint 2010 ? I know when creating new content types its possible to put them in a group (for exc. custom content types), but is it somehow possible to find out if existing content types are out of the box or custom created ? I mean is there something like a flag or property that can be queried with powershell/console application to find out if a content type is custom ?

Thanks a lot for answers !

Answer 1

SPBuiltInContentTypeID: A class that retrieves SPContentTypeId objects that represent identifiers (IDs) for built-in content types.

Answer 2

As far as I know, there is no such flag/property. But luckily built in content type ids are documented:

http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spbuiltincontenttypeid_members.aspx

You can use it to compare your content type's id to determine if its custom or OTB.

Answer 3

Comparing my custom content type id with the list of avaliable SPBuiltInContentTypeIDs doesnt seem to work - there are a lot more built-in content types that have not been documented here http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spbuiltincontenttypeid_members.aspx

for eg: video, audio, indicaors, reports - these are available OOTB with SP, but are not listed in the above link.