An EXE file is a Windows executable — a program that runs code directly on your computer with whatever permissions your user account has. This makes EXE the single most dangerous file type you'll encounter. But it's also the format for every legitimate Windows application. The question isn't whether EXE files are safe in general — it's whether this specific EXE is safe.
Before running any EXE, ask three questions. Where did it come from? Software downloaded from the developer's official website or a trusted platform like the Microsoft Store is almost certainly safe. Software from random download sites, email attachments, or Discord messages is high-risk. Is it digitally signed? Right-click → Properties → Digital Signatures tab. A valid signature from a known company (Microsoft, Adobe, Google) means the file hasn't been tampered with. No signature or an unknown signer is a yellow flag.
For files from uncertain sources, scan before running. Upload to VirusTotal.com — it checks the file against 70+ antivirus engines simultaneously. If more than 2-3 engines flag it, don't run it. Windows Defender also scans EXE files automatically before execution, but a second opinion from VirusTotal is worth the 30 seconds.
Some practical rules: never run an EXE that arrived via email unless you specifically requested it. Never disable Windows SmartScreen warnings to run an unsigned EXE. If a website asks you to download an EXE to "view content" or "update your browser," that's a scam. Legitimate content doesn't require installing software.