I’m giving Pespective a try.  It had all the features I was looking according to www.wikimatrix.org:

You want some installable software with WYSIWYG editing and a page history which uses file based storage and is Free and Open Source and which is written in C or C# or C#/XSLT or C++.

There is exactly one Wiki available matching your criteria:

• Perspective

Perspective uses Windows Indexing Service to implement it’s search function.