IFileContentManager and FileSystemCore not available

Hi,

I'm exending RTC in our own eclipse plug-in where I'm trying to programmatically modify and deliver a versionable item in a component.
In my RTC eclipse client I could not find IFileContentManager and FileSystemCore from com.ibm.team.filesystem.rcp.core_2.0.0.I200906111535 plug-in.
Is anybody aware of any changes to the APIs or am I missing something here?

Since my actual requirement is to modify and deliver an existing versionable item in a known component, please suggest me if there is any better way of doing it.

Thanks in advance.

Regards,
Sethu