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Home/ Questions/Q 6529781
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T09:40:35+00:00 2026-05-25T09:40:35+00:00

On my old XP computer, running an XBAP from Visual Studio would open it

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On my old XP computer, running an XBAP from Visual Studio would open it up in Google Chrome. I switched to Windows 7, and now running an XBAP downloads the file like it were a ZIP or an EXE instead of opening it in the browser. The same thing happens in FireFox.

Does anyone know why I am suddenly downloading the file instead of opening it? And how I can fix it?

And yes, I know XBAPs are not meant to run on Chrome, but if you copy a bunch of FireFox dlls to the Google\Chrome\Application directory it runs just fine (steps here if anyone wants).

Even before I had that setup, it would still try and open an xbap in chrome and I could copy the URL to IE for testing. Now it downloads the file so I can’t even do that.

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  1. Editorial Team
    Editorial Team
    2026-05-25T09:40:36+00:00Added an answer on May 25, 2026 at 9:40 am

    Got it… Firefox (and Chrome, since I’m using FF dlls to run XBAPs in Chrome) runs XBAPs by using a dll from the .Net 3.5 Installer, and since Windows 7 comes with 3.5 already installed, this dll isn’t available

    To fix this, I needed to copy the file

    C:\WINDOWS\Microsoft.NET\Framework\v3.5\Windows Presentation Foundation\NPWPF.dll

    from an XP machine to

    C:\Program Files (x86)\Mozilla Firefox\plugins

    (if FireFox folder doesn’t exist, create it)

    Also in case you’re looking to do the same, I think this was the link I used to figure out what FF files I needed to copy to Chrome’s installation directory:

    The following libraries found in Mozilla Firefox instalation directory
    C:\Program Files\Mozilla Firefox have to be coppied to Chrome
    installation directory:

    • js3250.dll
    • mozcrt19.dll
    • nspr4.dll
    • nss3.dll
    • nssutil3.dll
    • plc4.dll
    • plds4.dll
    • smime3.dll
    • sqlite3.dll
    • ssl3.dll
    • xpcom.dll
    • xul.dll

    Assumming Chrome is installed in the following directory, USER
    corresponds to your windows user.
    C:\Users\[USER]\AppData\Local\Google\Chrome\Application

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