We have a prospective new client whose web site was developed on the Kentico platform, version 5.0. Their relationship with their former web development company went sour and they have not parted on good terms. Many custom web parts were designed for their web site and we are hoping to be able to modify the custom web parts. But, we don't have access to the Visual Studio solution and as yet, don't have access to the source files.

Kentico is new to us. How could we modify the custom web parts? Can we access them through the portal engine? We noticed that web parts could be exported. Could we possibly export them, modify them and then import them again using the Import Sites or Object link in the Site Manager? It's possible we could get access to the source files on their file system, however, we were hoping we could modify the parts using the Kentico portal.