Hello drjonz2 and welcome to the forums!
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Could you make sure that VLC is enabled in "Configurate OpenLP > Mediaplayers"?
(Settings > Configurate OpenLP)
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If not, try enabling it and then restarting OpenLP.
You may also try disabling other mediaplayers.
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If VLC is not available, make sure you have installed 32 bit version of VLC.
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Have you already imported the file into "Library > Media"?
If not, you have to do that since it's not possible to directly drag files to Service.
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Hope this answers your question and all the best,
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Azaziah