look for a project file. The pattern for the extension will be ##proj. Keep in mind that unless it's presented as a .net project, it's probably written in a different language even if it says that it will interface with .net
The download button only downloads the .dll and an app that uses it, and some documentation. follow the Code tab to download the source. Looks like you might need git for windows you can get one option here
I Developed application in C# with crystal reports and created setup file in third party (Advance) Installer.When i installed my application on client system application is working but ...