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A "null" extension usually means that the file contains no data or is corrupted and/or was corrupted during the transmission of the file.

Windows cannot open this file because it does not know what the format is. There are a few software applications available to possibly convert the "null" to something readable, but those cost money and have only one purpose.

The best bet is to have the person who sent you that file resend it in another format ... possibly as a PDF as that seems to be a good universal application that most everyone can access.

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9y ago

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