Hi, just found this website and playing around with the tool. My question is how do I actually make .wa file addons. 

 

I tried following this guide: (http://www.wincert.net/forum/topic/5833-guide-creating-addons/), but I can't seem to get my programs to actually load during windows installation (using virtual box).

 

I downloaded the 7z.wa file (http://www.wincert.net/forum/index.php/topic/7239-7-zip/) and that didn't even install during installation. Can anyone help me understand what I'm doing wrong?

 

Here is an example .wa that I tried creating. (https://www.dropbox.com/s/n2nqknyiu1m3aio/7z.wa)

 

 

Attached is an error I get when if I try loading an addon in the tool.

Run WinToolkit as Administrator

Tried that and I still can't get it to work.

I downloaded the example .wa that you tried creating.
I don't have problem loading your addon using WTK
I loaded your 7z.wa into Addon maker tab, there was no entries in "Copy Files', "Copy Folders", Import Registry" etc, meaning you need to provide instructions to WTK how to deal with your files. Or perhaps due to the problem you are facing, these instructions are not created.
WA addon copied directly to image folder via instruction listed in Tasks.txt. So don't put your 7zInstaller (7z920.exe) in the .wa

I would suggest you download some sample addon to familiarize it's structure/instructions.

If you are adding an installer exe (like this sample), then you might try adding them as Switchless.exe

As to your screenshoot problem, I have no idea. Sorry.