AI & Digital Life · 55 sec
File Extensions Describe Formats, Not Safety
A familiar-looking filename can still be dangerous.
The useful idea
- Understand
A file extension suggests the format that software should use to open a file.
- Connect
Attackers can use misleading names, hidden extensions, or crafted files that exploit vulnerable applications.
- Apply
The filename does not prove who created the attachment or what the file will do when opened.
Why this matters
Recognition of a familiar format can create trust that the sender and file have not earned.
Try this
Verify unexpected attachments with the sender through another channel.
Test your recall
What is the most useful next step for “File Extensions Describe Formats, Not Safety”?
- Verify unexpected attachments with the sender through another channel. — correct
- Act immediately without checking context.
- Assume the first impression is complete.
Recognition of a familiar format can create trust that the sender and file have not earned.