I am searching for a wordpress plugin to increase the search in to the content of accessories (typically text file like doc or Pdf).

This subject within the WordPress support forums addresses this, and indicates Google custom search, that ought to theoretically search Ebooks and Paperwork and could be easy to setup and check out, or even the Search Everything wordpress plugin, which can be what Shaun stated does not operate in his comment above.

Additionally, there are the Sphider Wordpress wordpress plugin, an search wordpress plugin that states support indexing PDF and DOC files. It may be harder to setup, but it is your best option I'm able to find.

i've that script (styles modification &lifier additional plug ins) to create wordpress as pdf internet search engine. please sent email in my experience: pije76[at]yahoo[us dot]com