Is there any benefit to running the 64-Bit version of WMP? I see Vista x64 runs 32-bit by default. I am going to install ffdshow but I'm not sure what version I should be going with.
Not entirely true. I could do some side-by-side to get some raw numbers for you, but on my collection of about 5500 MP3s, the 64-bit WMP11 parses and indexes the library (from scratch) in about 1/3 to 1/2 the time required by the x32 variant. However, for normal playback, there's no functional difference although there is some merit to the claim that it makes the overall system a bit more "stable" since it doesn't require WoW64 to run.
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