Not sure about the "programs.lst" file. Just did a sweeping search of C:\ drive and nothing came up.
The Program files (.prog) are in the "C:\
ProgramData\Cakewalk\Dimension Pro\Programs" folder.
The Multisamples (.flac) they use are in the "C:\
Program Files\Cakewalk\Dimension Pro\Multisamples" folder.
(BTW, Dimension LE uses .wav files instead of .flac.)
I use both 32 and 64 bit versions so my samples for both are in the "Program Files (x86)" folder.
When all else fails, uninstall it, download the installation file from your account and reinstall it. Make sure you pick the 64 bit option. Then do a rescan in Sonar.