FMServer 17 Manual describes:
Changed and removed features
•Specifying file extensions for runtime solutions is no longer supported.
- is there no other option but change suffix of all former Runtime files?
- was there any technical constraint which made this a necessity?
Be aware that this limitation breaks concept for easy scalability with deployment starting with Runtime, moving up to FMPro P2P Hosting and up to FMServer (with Additional Database Folder Path )