I have not tried this but I have downloaded the zip file and had a look at it's contents.
The zip file contains the source code and an ini
file that looks like it can be configured to start the CP with some modifications and would be placed in the same location as the CP's exe file.
From the CP web page:
Note that Version 2.5 now also honors an xampp.ini file (see included sample).
Using the ini file you may be able to specify a path to Apache and MySQL.
Perhaps you would like to download this zip file yourself and do some experimenting with it and, if you would be so kind as to post back your findings, I am sure it would be much appreciated by the community.
The link To fetch the source code, click Support...
button can be found by clicking the Help button in the CP or go there directly:
Download XAMPP Control Panel Version 2.5 executables and source code (190 KB)
CP Home Page
BTW, You can, if you wish, purchase a Support Token and deal directly with the CP's authors.