Affordable CMS supporting multiple formats

Hi folks,
 
We are trying to build a sizeable (50 trainers, thousands of trainees) training application 
for our company. One essential component is CMS. It doesn't have to be a very 
comprehensive solution. We may need some basic functionality like storing, sharing, 
categorizing, searching, usage reporting etc. IDEALLY it should be able to recognize and 
handle these popular formats to some extent: Flash, PowerPoint, PDF, Word. 
 
Do you have any suggestion/recommendation if we buy and integrate such a CMS solution?
 
thanks
 
Boming


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