Just for addition - by using a simple plug in for the ApiViewer, you do not need to change the "Declare" into "WinAPI" by hand. Just download the attachment, unpack both files to the \PlugIns folder of your installation of ApiViewer and select "Jabaco" as language in the options
If you should wonder why it complains the plugin is not signed - I asked Christoph (the programmer of ApiViewer) how to sign the file, but he cannot find the program anymore. But as soon as the new version of ApiViewer is released, I will sign the new plug in