Your analogy is not accurate. A vendor is responsible for providing security updates for components that they distribute with their product. If Microsoft provides Flash 6 with Windows XP, then they are responsible for providing Flash 6 security updates for the duration that Windows XP is supported.
In other words, a fully-patched, supported Windows XP system with no additional software installed should be secure to known vulnerabilities.
This liability is probably why Microsoft stopped distributing flash after XP.
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