Search content of files with unknown extension

Question

I have the problem that Windows Server 2008 does not seem to search through the content of files with a unknown extension (csv). How can I change this? I had already installed the indexing service Role and changed its "Generation-Tab" Setting to "Index files with unknown extension" what does work in Windows XP but not yet in 2008. Do I have to restart the server first or is there a better way to say Windows that it also should search the content of unknown files?