Assignment A2.3: which attachments do you not open?

You are Sanne de Vries (sanne@example.com), owner of Bloemenatelier Example.
Below are ten emails with attachments that arrived today. Write down the numbers
of the attachments you do NOT open (without first checking through another channel).

 1. From your accountant (regular contact, expected): jaaroverzicht-2025.pdf
 2. From "PostNL" <track@pakket-melding.example>: Verzendlabel_8841.html
 3. From an unknown sender: factuur_10112026.pdf.exe
 4. From supplier Daan (expected, you asked for it): offerte-bloemen-voorjaar.xlsx
 5. From "Belastingdienst" <noreply@belasting-teruggave.example>: Aanslag.zip (with password 1234 in the email)
 6. From a customer you know, with no text in the email: Document.docm
 7. From your colleague Daan (you weren't expecting anything): foto-workshop.jpg
 8. From an unknown sender: Betalingsherinnering.iso
 9. From your bank (sender address doesn't match the bank's domain): Rekeningoverzicht.pdf.lnk
10. From the municipality (you had applied for a permit, sender domain is correct): besluit-vergunning.pdf