fix: allow Open() on external files and add OpenDiskImage API#2
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DirItem.Open() previously rejected DirItemExtFib (external files) with ErrIsDirectory. ExtFib uses the same block-vector layout as IntFib so the fix is to widen the guard to IsFile(). Also adds VBK.OpenDiskImage(path) which opens a .vmdk/.vhd/.vhdx entry and returns a flat readable DiskImage. Multi-extent VMDKs are reassembled automatically via the existing openVirtualDiskReader logic, with a raw-FibStream fallback for unrecognised disk formats. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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DirItem.Open() previously rejected DirItemExtFib (external files) with ErrIsDirectory. ExtFib uses the same block-vector layout as IntFib so the fix is to widen the guard to IsFile().
Also adds VBK.OpenDiskImage(path) which opens a .vmdk/.vhd/.vhdx entry and returns a flat readable DiskImage. Multi-extent VMDKs are reassembled automatically via the existing openVirtualDiskReader logic, with a raw-FibStream fallback for unrecognised disk formats.