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Thunderbird 78.6.0

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  • 1 has this problem
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  • Last reply by Aiyva

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Thunderbird 78.6 (32x) Windows 10 Pro 20H2 Today I stumbled with a problem, this was not the case before. File extensions for Documents attached to an incoming letter are truncated. So for the Excel file, the extension is .xls_ instead of .xlsx As a result, the document does not tear off. You need to save the file, change the extension in the explorer, only then you can open it. Can someone help solve this problem?

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Chosen solution

Do you have Kaspersky? The underscore is caused by its attachment filtering.

https://support.mozilla.org/en-US/questions/1319835

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Chosen Solution

Do you have Kaspersky? The underscore is caused by its attachment filtering.

https://support.mozilla.org/en-US/questions/1319835

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Yes? I have KIS it helped, thank you very much, Happy New Year, health to you