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I've added a feature that lists all used filters when rendering a file but unluckily it appears not to catch the first filter in graph - the one that is created with IGraphBuilder::AddSourceFilter call. My (wild) guess would be that the graphbuilder is instructed by templates from 32-bit filters (either Haali or Gabest source/demux filters) to use some 32-bit source/demux instead of "File Source (Async.)" that for obvious reasons won't work and then the graphbuilder stops trying. To verify this you might simply check the result value of a IGraphBuilder::AddSourceFilter call.
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