Are you saying that you have no problem at all opening files that were initially created on your computer's hard drive? If you send a local file as an e-mail attachment to yourself, then can you open that file?
Is there something special about those files that your colleagues send? Content? File size?
Stefan Blom
Microsoft 365 Word MVP since 2005
Volunteer Moderator (Office)
MS 365, Win 11 Pro
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Please note that I do not work for Microsoft
MVP program info: https://mvp.microsoft.com/
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