PDM Archive Server components installation location

On our Archive server (PDM Pro) the PDM Archive Server program files are not installed in the normal C:\Program Files\.  Instead it is installed on the much larger disk for archive files, D:\Program Files\SOLIDWORKS Corp\SOLIDWORKS PDM.  I have not been able to find good reason why the installation location was not on the C drive with the OS and all the rest of the installations.  Checking if any PDM admins or other gurus know of reasons why it may have been done this way?  Original setup was version 2019.