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How can I configure Thunderbird to use the Excel Reader 2.0 app to open Excel attachments in Windows 10

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I am running Thunderbird on a Windows 10 computer. I have installed the Excel Reader 2.0 app on my computer.

When I try to open an Excel attachment in an e-mail, Thunderbird asks me what application to use to open the file, but the Excel Reader 2.0 app is not listed.

HELP

I am running Thunderbird on a Windows 10 computer. I have installed the Excel Reader 2.0 app on my computer. When I try to open an Excel attachment in an e-mail, Thunderbird asks me what application to use to open the file, but the Excel Reader 2.0 app is not listed. HELP

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When you try and open a file type that is not defined in Thunderbird you get a dialog box with suggestions. You also have the choice of Other. Select Other and find this app.