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The WMP plugin suggested on your webpage does not install, gets corrupt message.

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My Firefox Options page does not show the np-mswmp.dll as installed. I downloaded the WIndows Media Player plugin from to my downloads folder (XP OS) per your webpage instructions here:

I changed the about: config flag to True for plugsin.load[etc]. Firefox did not detect the new plugin. I tried to move it to c:\Program Files\Firefox\browser and Windows would not let me. (I could not find a \plugins folder there.) Then I tried to install it by using the gear icon and "Install Add-on from file". Firefox would not let me, said it was corrupt. What gives?

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Npdsplay dll is what you need for WinXP and earlier.

Looks like you have it.