I'm have the same problem as most posting here - getting the .dll's to show in a Pdn menu.
psfilterpdn.dll shows and works from the effects folder.
Each plugin(.dll) I've placed in there since doesn't show in any Pdn menu.
log of my efforts -
running win7 home premium, 64bit.
Logged in as admin - extracted Pdn v3.5.10 to c:\program files\Paint.Net.
Extracted psfilterpdn.dll, place in Effects folder - plugin shows in Effects menu, and works.
Unzipped Evan's eoeffects.dll, Mike Vinther's increaselocalcontrast.dll, dragged to Effects folder - restart Pdn.
Those two plugins don't show in Effects/Adjustments menu of restarted Pdn.
Removed all .dll's from Effects folder. Checked 'unblock' for dlls properties.
Uninstalled Pdn. Reinstalled Pdn. Placed .dll's in Effects folder. Restart Pdn. Psfilterspdn.dll works. Eoeffects + increaselocalcontrast.dlls still don't show.
Need some new ideas on this, please.
D