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(Updated) Microsoft Purview | Endpoint Data Loss Prevention now supports a pre‑curated file extension list

MC1384415

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MC1384415
Microsoft Purview
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#562993In development
Endpoint Data Loss Prevention — Endpoint DLP now supports a pre curated list of file extensions for the file extension condition
Rollout startDecember 2026

Added to roadmap: 27 mei 2026 | Last modified: 18 sep 2026

Endpoint DLP now includes a pre curated list of file extensions for the file extension condition. Previously, file extensions were entered as free form text, which could result in unsupported or non-scannable extensions being used. This could lead to gaps in protection and increase processing overhead on endpoints. With the pre curated list, you can select only supported file extensions.…

Updated September 18, 2026: We have updated the timeline. Thank you for your patience.

What and why

Microsoft Purview Endpoint Data Loss Prevention (DLP) is improving how file extension conditions are configured to help ensure policies are accurate, reliable, and efficient. By limiting file extension selection to supported, scannable file types, this update reduces misconfiguration risk and improves enforcement consistency across endpoints while maintaining existing protection coverage.

This change aligns Endpoint DLP configuration with supported enforcement capabilities and helps admins create policies that behave as expected.

This message is associated with Microsoft 365 Roadmap ID 562993.

Rollout schedule

General Availability (Worldwide): We will begin rolling out in mid-December 2026 (previously mid-September) and expect to complete by end of December 2026 (previously end of September).

Impact on your organization

Who is affected

Platforms/Services:

  • Microsoft Purview
  • Endpoint Data Loss Prevention
  • Supported Windows endpoints

What will happen

  • Endpoint DLP now includes a pre‑curated list of supported file extensions for the File extension condition.
  • Only file types that are supported and can be scanned appear in the picker.
  • Free‑form text entry for file extensions is no longer available.
  • Existing policies continue to enforce as they do today unless edited.
  • If an edited policy contains unsupported file extensions, those entries must be removed before the policy can be saved.
  • To maintain coverage for unsupported or non‑scannable file types, use the Apply restrictions to only unsupported file extensions feature. Learn more: Help protect against sharing of a defined set of unsupported files.
  • Your overall protection posture does not change with this update.

    • Screenshot 1: Add file extension options:

    Screenshot 2: Unsupported file extension warning in Microsoft Purview policy settings:

Action Required / Recommendations

  • No action required if you are not modifying existing policies.
  • If you plan to edit or create a policy:
    • Review your current file extension list.
    • Keep supported file extensions.
    • Remove unsupported file extensions and use Apply restrictions to only unsupported file extensions feature instead.
    • Use the curated list when adding new supported file types.

Learn more

Compliance considerations

No compliance considerations identified, review as appropriate for your organization.

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