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Mozilla Thunderbird. create an association?

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I have a CAD program with it's own contacts. TurboCAD 2017. Every time I try to send CAD drawings. I get a message. ( no e/mail associated. create an association ). How? I tried every thing. Thanks for your time. Really need help.

     Bailey
I have a CAD program with it's own contacts. TurboCAD 2017. Every time I try to send CAD drawings. I get a message. ( no e/mail associated. create an association ). How? I tried every thing. Thanks for your time. Really need help. Bailey
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Chosen solution

In order for an app to email a file through TB, TB has to be defined as the default mail client, and the app has to support SimpleMAPI operations. On top of that, if the app is 32-bit, TB has to be 32-bit. This has nothing to do with Windows being 32 or 64 bit. What 'bit' is your TurboCAD and TB (Help/About TB)?

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Chosen Solution

In order for an app to email a file through TB, TB has to be defined as the default mail client, and the app has to support SimpleMAPI operations. On top of that, if the app is 32-bit, TB has to be 32-bit. This has nothing to do with Windows being 32 or 64 bit. What 'bit' is your TurboCAD and TB (Help/About TB)?

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Thank You Miss. I think I have it now.

        Bailey