Windows Media Player - MozillaZine Knowledge Base

1. If some or all of the files are missing, you can download the individual files from and place them in the Windows Media Player directory (usually C:\Program Files\Windows Media Player):
* npdsplay.dll:
* npwmsdrm.dll:
* npdrmv2.dll:

2. Reopen your browser and see if the WMP plugin is now working. If it isn't, follow these additional steps (Windows Vista users, go to the last step):

3. A Windows Media Player Plug-in for Netscape Navigator installer (not supported on Windows Vista) can be downloaded here and should resolve the issue [3] but the included files are older versions. After running the installer, copy the more recent versions of npdsplay.dll, npdrmv2.dll and npwmsdrm.dll from to the Windows Media Player directory, if they were replaced by older versions.

4. If the Windows Media Player plugin still does not work, copy the npdsplay.dll, npdrmv2.dll and npwmsdrm.dll files to the installation directory plugins folder; for example, to the C:\Program Files\Mozilla Firefox\plugins folder in Firefox.