I use the 32b version, because the 64b with me altogether only trouble made.
That with the Multihighlighter is very well known to me and has so far also worked flawlessly. Only from the current version (not the beta) PSPad does not recognize the open CSS file as such. Behavior as written in my post! -- <https://forum.pspad.com/read.php?4,78249,78252> PSPad freeware editor https://www.pspad.com