VB programmer needed to write one piece of software

I have a need software tool created in VB to take pull down menu items, and text entered by users and convert it into a simple text file output. I have the software tool 90% done. It is attached. I believe it is VB.net. Present programmer that created it no longer in business so I can not get source code. This means it needs to be recreated. It works and runs good. Need it recreated and a few items added. Unsure if there is any way to uncompile it and get the actual source from the EXE attached. Will require source files to be provided along with final file as we move along with project. Software tool to be an .EXE file and all items required to make tool run to be included in .EXE file so there is no installing of files on customers PC. The tool is attached to this post. You can run it and see what it does. Just need to recreate it, and add a couple of features to the tool. I can give you all addressing required etc. It is a user interface tool to create a .txt config file for a micro controller.