Changing the Assembly Extension when compiling?

[Administrator]

I am building class libraries that are plug-ins for a new application. Instead of the class library ending in .DLL when it's compiled, I'd like it to end in .plugin. Any ideas how to change the extension of the output file?

 

[Administrator]

Never mind, I used a post build event to handle this:

copy "$(ProjectDir)$(OutDir)$(TargetFileName)" "$(ProjectDir)$(OutDir)$(TargetName).plugin"