Still no 64-bit support?
You can run Paint.NET in 32 bit mode by using a tool from Microsoft called corflags.exe
It comes with the .NET SDK
run it like this in the Paint.NET folder (command line prompt):
corflags paintdotnet.exe /32BIT+
to revert to 64 bit mode do:
corflags paintdotnet.exe /32BIT-
I figured out this after reading this blog post.
I'm not sure about the Licensing so I can't provide a package with corflags.exe.
On my system it is located in the folder "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\bin\x64\".
It would be nice if Paint.net was provided with a 32bit launcher that basically just launches the app in 32 bit mode on 64 bit OS. To be useful for those legacy plugins that has no 64 bit support (or depend on 32 bit only third party libraries).
I copied Paintdotnet.exe to paintdotnet_32.exe and then reverted to 64 bit on the original paintdotnet.exe