I am able to install DS-5 on an OS (for example Windows 10) that is not officially supported. What is the behavior of DS-5 on such an OS? Will it work partially, for example?
DS-5 is a suite of tools, including Eclipse IDE, compilers (ARM compiler 5, ARM compiler 6, gcc), DS-5 debugger, Streamline performance analysis tool.
Though an OS may not be listed as supported, individual tools may be supported. A good example is Mac OS, where Streamline and Eclipse IDE are supported while other tools are not.
The best way to find out if a tool would work is to check the DS-5 System requirements page