If you want to redirect the Ampps htdocs location, let's say from "C:Amppswww" to "D:Amppshtdocs", here is the easy way to do it.
Go to the Ampps installation dir and open this file:
Amppsapacheconfhttpd.conf
In this file, find the line:
DocumentRoot "{$path}/www"
and change it to
DocumentRoot "path/to/xampp/htdocs"
Also find the line
and change it to