winmail.dat to Excel — what was inside, as a table
Turn winmail.dat files into an Excel workbook: sender, date, subject and the names of the attachments hidden inside.
About this conversion
One winmail.dat is a puzzle; a folder of them is a filing problem. Select as many as you have and each container is unpacked into a row: who sent it, when, what the subject was and which files were hidden inside. It is the fastest way to find out which of forty unreadable attachments holds the invoice you are looking for.
Just want to look inside it?
The same tool without converting anything: open a winmail.dat archive and read it.
You are not locked into XLSX
The file is parsed once and stays open, so the format is picked at the end rather than the beginning: the same winmail.dat can leave here as CSV, ZIP, EML, MBOX, PDF, HTML, TXT or JSON. Before that you can search it by subject or address, filter by year, sender and attachment type, mark the duplicates and look through the archive overview.
Questions
- Can I open several winmail.dat files at once?
- Yes. Select the whole folder and each file becomes a row in the same workbook.
- Does the table include the attachment names?
- Yes — the names and how many there are, which is usually the reason for opening these files in the first place.
- Is this a real .xlsx file?
- Yes, a genuine Excel workbook, not a renamed CSV: the columns keep their types and long subjects survive.