Microsoft KB Archive/166694

= INFO: Internet Explorer Support of Netscape Plug-in =

Article ID: 166694

Article Last Modified on 5/12/2003

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APPLIES TO


 * Microsoft Internet Explorer 3.01
 * Microsoft Internet Explorer 3.02
 * Microsoft Internet Explorer 4.0 128-Bit Edition
 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 5.5

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This article was previously published under Q166694



SUMMARY
Although Internet Explorer supports Netscape Plug-ins, there are some limitations to this support. Below is a list of several known issues:
 * Internet Explorer does not support the type= attribute for plug-in instantiation in Internet Explorer 3.x.
 * Internet Explorer does not support the NPN_PostURLNotify and NPN_GetURLNotify functions.
 * Internet Explorer (16-bit) does not support the NPN_PostURL function.
 * Internet Explorer does not support the NP_ASFILEONLY flag on calls to the NPP_StreamAsFile function. Use the NP_ASFILE flag instead.
 * Internet Explorer 4.0 and 4.01 (32-bit) stops responding (crashes) if the NPN_PostURL function is called. This is fixed in Internet Explorer 4.01 Service Pack 1.
 * Internet Explorer does not support the Java Runtime Interface (JRI)..
 * All plug-ins are notified that they are 0.9 level, even though Internet Explorer does not support some 0.9 level functionality.

Plug-in developers should check the user agent string, as well as the version number. If the user agent is Internet Explorer, do not make calls to either NPN_PostURLNotify or NPN_GetURLNotify.

