One method of opening strange attachments from trusted sources

Whilst I was on holiday last week, a professional photographer friend of ours sent me a list of gear that he is selling now that he has switched from Nikon to Canon (come on Nikon, can we have a full-frame image sensor in a digital SLR please…). Unfortunately, he is a Macintosh user and the attachment arrived in Microsoft Outlook as a a .DAT file. Not having a clue what application he had created this list in, I opened it with Notepad and found the words Microsoft Excel Worksheet contained within all of the binary garbage. I opened the file again (this time in Excel) and hey presto – a list of equipment for sale!

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