There are two solutions to implement 64 bit processing.
1. Command Prompt
corflags application.exe /64BIT+
2. Developer Environment
Itz more of IDE setting to enable 64 bit power. You need to right click your project, and select properties. In properties, select the build tab. Under platform target, select x64.
Hit Ctrl+Shift+S to save all files, right click the solution and select "Clean" to get rid of old binaries. Any builds after that should be 64 bit