Well, I have the following folder structures for Dimension Pro 1.5
C:\Program Files\Cakewalk\Dimension Pro\Multisamples
And within the above folder are a bunch of folders, like the following:
C:\Program Files\Cakewalk\Dimension Pro\Multisamples\01 - Grand Piano
C:\Program Files\Cakewalk\Dimension Pro\Multisamples\02 - Drums
C:\Program Files\Cakewalk\Dimension Pro\Multisamples\03 - Organs
etc...
And within each of the above folders are sub-folders with files with 'flac' extensions, and also files with 'sfz' extensions.
Using Regedit, in the Local_Machine key, in the 'dp' key in Cakewalk Music Software, there is a key called 'Multisamples Folder', and its data contains: 'C:\Program Files\Cakewalk\Dimension Pro'.
In the 'dp' key, there is another key called Contents Folder, and its data also points to: 'C:\Program Files\Cakewalk\Dimension Pro'.
I had downloaded some X2 Dimension Pro content, from the Content Club, and that included a Holiday Pack, and some Factory Strings from Digital Sound Factory, and those sounds are also found in C:\Program Files\Cakewalk\Dimension Pro\Multisamples.
I hope the above helps,
Bob Bone