you first need to determine if the project is .net 4.* or .net core. if it is an older project and there are no .res files, I'd guess 4., but if in the bin folder of a deployed copy, there <progname>.exe.config then its 4..
with vs create new project of "Windows Form App (.Net Framework) named SEE_MEDX. build the project.
you will need a list of the dll's in the project so you know what additional dlls where added. for each dll in the deployed project that is not in new project, you will need to google to find the source (typically a nuget). Then use package manager to add the required package.
now delete the *.cs files in the new project, copy all the old *.cs files to the new project folder. in vs click on add-> existing item, and elect all the *.cs files. then build