An easy alternative if you don't know how to code this would be to get yourself a free web host and set up a private BBS such as Invision Power Board or InvisionFree. You would have to copy each of your docs and paste them in as posts, but then you could use the board's search feature to find the document you need.
There are also many free content managers available on the web. Try doing a google search for "free content manager" and you should find some pretty flexible software.
In either of these cases (using outside software), you could optionally set the software up on your own machine as opposed to the free web server idea. I just included that in case you didn't know how or did not want to invest the time it would take to install the required components (such as mySQL). Hope this helps!