The source is largely irrelevant since we are not likely to be wanting
to ship updates to the MIME database as registry updates, instead of
just changing the code.

usually a good indicator of a bug elsewhere in Wine.

Mark todo a test that depended on the bug to succeed.

- Cleanup GetSrcAndOpFromValue().
- Use naming more consistent with the rest of the file.

msxml3: Initialise output interface pointers to NULL in xmlnodelist_QueryInterface and xmlnodelist_nextNode.