US Trends

this file came from another computer and might be blocked

“This file came from another computer and might be blocked” is a Windows security warning that appears on files downloaded from the internet, email, network shares, or copied from other PCs, to reduce the risk of running potentially unsafe content.

What the warning means

Windows tags some files as coming from an “untrusted” or external zone (internet, network, email), then restricts or warns before opening them.

This behavior is part of built‑in protections like SmartScreen and Attachment Manager, and does not automatically mean the file is malicious, only that its origin is considered higher risk.

When you typically see it

You are most likely to run into this message when:

  • Downloading programs, documents, or archives from a browser such as Edge, Chrome, or Firefox
  • Opening documents or attachments saved from email clients like Outlook
  • Copying files from USB drives, external disks, or network shares in an office or home environment
  • Working with Office files that open in Protected View before editing is allowed

Is it safe to unblock?

Unblocking can be safe if you trust the file’s source and have verified it is clean.

If the origin is unknown, suspicious, or from an unsolicited email or shady website, keeping the block and scanning with reputable antivirus before opening is the safer choice.

How to unblock a single file (Windows)

For a file you know is safe, you can usually remove the warning like this:

  1. Right‑click the file and choose Properties.
  2. In the General tab, look near the bottom for a Security section.
  3. Check the Unblock box (or click Unblock) if it is present.
  4. Click Apply , then OK , and reopen the file.

Many Office documents will then open normally instead of always being stuck in Protected View.

Extra tips to stay safe

  • Keep Windows, Office, and your antivirus up to date so genuine threats are more likely to be caught automatically.
  • Only unblock files from sites, colleagues, or devices you genuinely recognize and expect; when in doubt, delete or scan first.

Information gathered from public forums or data available on the internet and portrayed here.