Installed Codec is a very informative utility that shows a list of all the DirectShow codecs, codifiers and filters installed on your PC.
For each of these components, Installed Codec shows you the following information on-screen: name, type, state, time of modification or installation, description, company, file name, etc. Also, it lets you enable or disable each one of them easily. You can also export the list in different formats: text, XML or HTML.