Janitorial: Get rid of W->A calls for metafiles

[Vincent Béron]

Not 100% about the part changing METAHEADERDISK.filename type. Can apps
access it directly and barf if they find WCHAR instead of CHAR? And is
the length set to 0x100 for binary compatibility?

Changelog:
Get rid of W->A calls for metafiles.

Vincent
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