Please also provide the plugin.cache file that should be found next to mptrack.ini.
D:\OpenMPT is just the path where the OpenMPT executable is located I guess, but the INI file suggests that it is not run in portable mode, so the mptrack.ini location should not be D:\OpenMPT but more something like C:\Users\<your user name>\AppData\Roaming\OpenMPT. Can you give the full path for that?
EDIT: The mptrack.ini file suggests that you were using OpenMPT 1.26.03.00, which is neither the latest stable version, nor is it the test version I asked you to test. In case you did use the latest test version, then it's the wrong mptrack.ini for some reason.