The word "support" has different meanings in the software industry. In some contexts, it has a very restrictive meaning: "application X does not support OS version Y" (or vice versa) doesn't just mean the respective vendors don't offer technical support. It usually means the application will not run at all under that OS, perhaps enforced by the installer.
In the case of scripts or characters, I would expect "OS version X does not support script Y" to mean there is no *out-of-the-box* support for that script -- no fonts, keyboards, spell checkers, special rendering engine support, etc. that ship with the OS or are available as a vendor update. But I would still expect to be able to install my own fonts or keyboard drivers, or copy and paste text in that script into an app or document, and have the system apply some default behavior and not actively prevent its use. This is a general comment, and not specific to what level of "support" any particular version of Windows or other OS provides for any particular script, except for the Word/PUA situation I mentioned earlier. -- Doug Ewell | Thornton, CO, USA http://ewellic.org | @DougEwell