Solved! Thanks, super big help directing me to that dB file. Here is my process:
1 - database file is indeed stored at C:\Users\<user>\AppData\Local\Pentax\Digital Camera Utility 4\PTXUTL.mdb. Make a backup of this file before making any changes.
2 - simply copying this file to my new computer would not work because my images are now stored on a different drive and in a different directory structure... the pointers in the database file would be pointing to the old directory location, not the new one, which is a problem. Now, if the new computer's drive is literally a mirror of the old one, a simple copy/paste of this PTXULT.mdb file would work.
3 - so... how to change the contents of the database file to reflect the new directory structure on my new computer? Well, as it turns out, the parameter database file (PTXULT.mdb) is actually a Microsoft Access database, as indicated by the mdb extension. I suppose mdb could mean something else but sure enough, this file opens up just fine into Microsoft Access.
4 - there are eight tables in the MS Access database but only one requires a change --> the table called t_files. This table has a list of all raw images that have parameters adjustments saved. The key field to change is called "dir" because this field contains the directory path for each raw image. For all 8k entries (my count, yours will differ), I needed to change only the first part of the "dir" field, from "C:\Users\<user>\pictures" to "D:\Pictures".
5 - I am not an MS Access expert by any means. Tried to highlight the "dir" field and run a standard Find...Replace but it would not work. Probably could have written an update query but that seemed overkill. So I just copied the "dir" column to a blank Excel sheet, ran a Find...Replace there, then copied it back into MS Access. Then saved & exited.
6 - I opened up PDCU4 and all my historical parameters were properly referenced - my raw images now look as they should! Whew.
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