Windows Forms in replit?
It probably is possible, but I'd recommend having Visual Studio (ex. 2017) so that you can actually edit the files. You will probably have to compile the form, then install wine, so that it will run.
if you can't use VS2017, you can invite me and i'll design it for you!
(just note that you can't update the file after it is out of Visual Studio, so you'd have to redesign it again.)