We are running HCL Domino 11.0
Sometimes when users receive emails from external senders. Then email attachments are changed to .dat files with a format like this att*.dat. It seems to happens for Word and Excel files.
Not all attachments are changed. It only happens in a few cases. I have not found any pattern for when it happens.
Last case I have seen was an email with two attachments a word file and an Excel file. Only the word file was converted to .dat. Filename are "att6bm22.dat" and "Annex 1 - Prices.xlsx"
.dat files can still be opened in for example Word.
Any idea how to fix this?