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Due to the fact that new content is constantly being added to the game official system requirements often change. In version 1.12.0 the requirements for Windows were increased from requiring 256 MB to 512 MB of RAM. Official Windows 98 technical support was dropped, even though the game continued to run fine until version 2.2.3. After version 2.2.3, the official patches to version 2.3.0 failed on operating systems earlier than Windows 2000. By knowledgeably using an old update executable with new patch data, Windows 98 and Windows ME users could update from 2.2.3 using one of the released patches. Once successfully upgraded, the new version of the game then worked with Windows ME, although version 2.3.0 did not work with Windows 98 Second Edition unless applying updates to the operating system, including an unofficial third party's operating system modifications.
You learn something new everyday. So, as long as someone's PC could handle an operating system upgrade, then your system would handle the updates. If not, you essentially had to purchase a new system. So, there is precedence.