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How do I get "mailto" links to specify my portable Thunderbird executable?

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Windows 7 Home Premium Thunderbird Portable 68.7.0

My Thunderbird executable is on an external USB disk at Q:\...\ThunderBirdPortable\App\thunderbird\thunderbird.exe

When I click on a "mailto" link in a web browser page, the "system" tries to run "C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe"

I have set Thunderbird to check whether it is the default client.

The list in "Control Panel/.../Default Programs" does not contain Thunderbird.

How do I get "mailto" links to specify my portable Thunderbird executable?

Windows 7 Home Premium Thunderbird Portable 68.7.0 My Thunderbird executable is on an external USB disk at Q:\...\ThunderBirdPortable\App\thunderbird\thunderbird.exe When I click on a "mailto" link in a web browser page, the "system" tries to run "C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe" I have set Thunderbird to check whether it is the default client. The list in "Control Panel/.../Default Programs" does not contain Thunderbird. How do I get "mailto" links to specify my portable Thunderbird executable?

Isisombulu esikhethiweyo

As you are using Thunderbird portable and not the standard Thunderbird desktop, I searched on the portable apps forum. Please read through all the comments at this link as they may help. https://portableapps.com/node/25189

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Isisombululo esiKhethiweyo

As you are using Thunderbird portable and not the standard Thunderbird desktop, I searched on the portable apps forum. Please read through all the comments at this link as they may help. https://portableapps.com/node/25189

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Thanks very much!

At https://portableapps.com/node/25189, the reply from AdrianK_IT on April 14, 2011 advised using "Tools > Options > Applications > mailto > Use other... > Browse" in Firefox.

That works for Firefox. It doesn't care about other browsers, of course. (But then... neither do I.)

Aside: My web search for "Thunderbird Portable default email program on Windows" returns a citation to https://portableapps.com/node/25189. But my search for "default email program on Windows" does not, in the first few pages, using DuckDuckGo or Google.