I'm running Windows 10, and since I'm running a 64-bit OS, I installed the 64-bit version of VLC. As with everyone else, the VLC option continues to be grayed out.
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I'll try the 32-bit version of VLC.
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Later: I uninstalled the 64 and installed the 32 (2.2.1). The option is still grayed out.
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OTOH, I don't see how OpenLP would know about the 32-bit VLC. Unlike the 64, which came with a setup.exe, the 32 came as a zip of the application folder. I moved it to C:\Program Files (x86), and it runs from there OK, but OpenLP can't know it's there.
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In VLC, I used the Preferences to associate VLC with .mp4, but still no luck.
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Lane