GtkD 2.x wraps Gtk+ 3.x so you will need the 3.8 runtime...

Did you check that path to Gtk runtime binaries is the first? I guess there...

Then upon continuing I get an infinitely repeating

Unhandled exception at 0x00000000 in WindowsApp2.exe...

...I've re-installed DMD, rebuilt GtkD, and installed GtkD.  Now a Win32 app compiles...

Your compiler is installed incorrectly and can not find phobos  of appropriate version. Check it...

...gtk.Main;

class HelloWorld : MainWindow
{
	this()
	{
		super("GtkD");
		setBorderWidth(10);
		add(new Label("Hello World...

I'm guessing I should try building a Win32 app and maybe those symbols will...

...new errors:

:\D\dmd2\windows\bin\..\lib\GtkD.lib(glib)
 Error 42: Symbol Undefined _D4core6memory2GC6qallocFkkZS4core6memory8BlkInfo...

Try to rebuild GtkD if you re-installed dmd. Check if Gtk path is the...

...html
C:\D\dmd2\windows\bin\..\lib\GtkD.lib(glib)
 Error 42: Symbol Undefined _D3std3utf10decodeImplFNaNePxakKkZw...