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Description

This PR adds a missing XLSX file signature to the MicrosoftOffice365Document class.

Problem

XLSX files with the signature 50 4B 03 04 14 00 00 08 08 00 were being incorrectly identified as ZIP files instead of XLSX files.

Solution

Added the signature 0x50, 0x4B, 0x03, 0x04, 0x14, 0x00, 0x00, 0x08, 0x08, 0x00 to the list of recognized Office 365 document signatures in the MicrosoftOffice365Document class.

Fixes

Fixes #48

Add the signature 50 4B 03 04 14 00 00 08 08 00 to the list of recognized
Office 365 document signatures. This signature is used by some XLSX files
and should be recognized as XLSX instead of generic ZIP files.

Fixes AJMitev#48
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Another XLSX signature: 50 4b 03 04 14 00 00 08 08 00

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