When Your In-House Windows App Gets Flagged as a Virus — Handling Microsoft Defender False Positives and Living With the Performance Impact (archived 2026-07-27)

We lay out the proper way to respond when Microsoft Defender flags your in-house Windows app as malware: how modern antivirus detection actually works, how to submit a false-positive report to Microsoft, how to restore a file from quarantine, and how to set up exclusions correctly along with their risks. Archived version of https://comcomponent.com/en/blog/windows-defender-false-positive-guide/, as published on 2026-07-27. The live article is maintained and may change after this date. First published 2026-07-17.