Todays version included a search function (Nov 11 2010) included a search function. One option was in include what file extentions were search, with a default including "TXT,PDF,DOC,PPT" etc. I added PPTX and DOCX to this list to include documents included in Office 2007 and Office 2010.
I am now not able to get into most admin areas of the site, with the error:
Invalid admin setting (block_search_'.pptx.'_to_text_env)
I have also not been able to get into the setting to remove PPTX as an option as it errors out with the same error.
Concern is that if it can not handle PPTX there may need to be a way of stopping the entry of this file type or at least a warning. Search function is also not working with the same error.