Hi guys; first off let me just say what a great project Programmers Notepad is, I've tried so many highlighting editors but finally settled on PN.
With my recent move to Windows 7 (x64), I as usual told PN to check associations to get it to set up said associations - this did not work; so I started pn using run as administrator, this populated the entries in registry and all seems correct - but plain old Notepad opens instead!
After some playing around I realised that non administrative users don't have rights to the entries pn has written; and sure enough on logging in as an admin things worked as expected.
I then reset the ACLs on the affected entries so that non-privileged user are able to read them - but this has not helped.
I added an association using FileTypeMan from Nirsoft and this worked as expected.
So this may be something you (pn team) want to look into; or if there is a workaround I would love to know.
Thanks.