Excel Add-In (Change existing add-in and program)

Job ID: 34297060

Budget: $30 – $250 USD

I have a program that was dropped in my lap that will need modification. However, even though I can install the program and see the Add-In in Microsoft Excel, I can't edit it. Also, in the source the .xlsm file doesn't appear to show any reference to the program being used. I can't seem to open the .sln file in Visual Studio. It just says VS 2013 can't open the file. I'll provide the entire source and bundled install. I need to figure out how to edit the application. What are the requirements and what do I need to do to edit it? That's the first milestone needed. I need to understand how to edit and change the program. I have worked a lot with MS Office, macros, VB.NET, C#, etc, but this thing baffles me. The first milestone will be $50.

Once I get a firm idea of what needs to be done, there will be more changes needed a week or so from now. I will create different milestones for this work once I determine what changes need to be made. Hopefully you'll be able to help me then to both make the changes and get things rebundled. That will be additional milestones.
Related categories: Excel Office Add-ins Visual Studio