Hi,

>I have to scan list of files (PDF And PowerPoint) and to retrieve the file\s which contain specific text.

I use MineText.EXE for this (http://text-mining-tool.com/). You can call it with RUN or ShellExecute, pass the name of the PDF file and get a pure text file. Then you can use FILETOSTR() to search inside the text file.

If you install Abobe's PDF IFilter or the free one from Foxit (http://www.foxitsoftware.com/pdf/ifilter/), you can additionally use Windows Search to search through the content of the PDF file after Windows Search Indexer has indexed the location of your PDF files. Craig Boyd has a sample on his blog how to use the search API (http://www.sweetpotatosoftware.com/SPSBlog/2008/12/08/VisualFoxProAndWindowsDesktopSearch.aspx).