Initial Programming Language used to run on Windows 98, when we upgraded the development environment that we use to create this program something got changed that stopped it working on Win 98, you get a stroppy little error message telling you to upgrade your version of Windows.

If there is any demand we will address this issue and make versions that will run on Win 98, in fact we plan to do this anyway, it's just not at the top of the "To do" list.