Microsoft has quietly begun rolling out Copilot-powered file actions directly into Windows File Explorer and the OneDrive taskbar flyout, letting Microsoft 365 subscribers summarize, ask questions, compare, and auto-generate FAQs from documents without launching Office or a browser. Announced on Thursday, the four new skills—Summarize, Ask a question, Create an FAQ, and Compare files—mark a significant step in Microsoft’s strategy to embed AI at the operating system level, moving beyond web-based interfaces.

What’s New: AI in the Right-Click Menu

The new features surface when you right-click a supported file stored in OneDrive. In Windows 11, you hover over the OneDrive submenu to reveal the Copilot actions; in Windows 10, they appear directly in the context menu. Alternatively, you can access them from the OneDrive Activity Center on the taskbar by clicking the three-dot menu next to a file. The four actions work as follows:

  • Summarize – Generates a concise, human-readable summary of up to five files, sparing you from opening each one.
  • Ask a question – Opens a chat-style Q&A interface that extracts answers from the selected document(s) and supports follow-up prompts.
  • Create an FAQ – Automatically produces a list of Frequently Asked Questions and answers derived from the file’s content, ideal for knowledge-base drafting.
  • Compare files – When you select two to five files, Copilot generates a comparison table highlighting metadata (author, last modified, dates) and content differences or summaries. This is especially useful for version reconciliation, contract checks, and initial resume screening.

The Copilot pane then appears anchored to Explorer, and all follow-up interactions happen in that lightweight panel. The heavy processing, however, occurs in Microsoft’s cloud—the desktop menu entries are essentially entry points to OneDrive Copilot functionality already available on the web. This cloud-processing model is explicit in Microsoft’s documentation and has implications for privacy, compliance, and corporate governance.

Supported Formats and Practical Limits

At launch, Copilot file actions focus on text-first formats. Supported file types include:

  • Office documents: DOC, DOCX, PPT, PPTX, XLSX
  • New Microsoft 365 structures: FLUID, LOOP
  • Universal text formats: PDF, TXT, RTF
  • Web files: ASPX, HTM, HTML
  • OpenDocument formats: ODT, ODP

Images, videos, OneNote notebooks, and folder-level Q&A are not supported yet—Microsoft has flagged media and some complex file types as coming in future updates. Multi-file actions (Summarize, Compare, Ask across files) are limited to a maximum of five files at launch. There’s also a practical size guideline: many Copilot file actions are restricted to files under roughly 150 MB for now.

How to Try It Step by Step

  1. Check eligibility – You need a Microsoft 365 Personal or Family subscription (with entitlement caveats for Family owners). Business tenants may require specific Copilot or Copilot-enabled licensing.
  2. Ensure files are in OneDrive – The actions operate only on OneDrive-managed files, and you must be signed into Windows with the same account.
  3. Open File Explorer – Right-click a supported file. In Windows 10, Copilot commands appear directly; in Windows 11, hover over the OneDrive submenu to reveal them.
  4. Choose an action – Select Summarize, Ask a question, Create an FAQ, or Compare files (for the latter, first select two to five files). The Copilot pane opens and returns the output; you can then ask follow-up questions.

Tip: Be specific in prompts. Generic requests yield generic results; precise instructions (e.g., “List three contractual clauses affecting payment terms and quote the nearest sentence”) produce more actionable output.

Productivity Wins That Matter

Embedding Copilot in File Explorer reduces context switching and accelerates common file tasks. For everyday Windows users and small teams, the time savings are tangible:

  • Faster triage – Get an executive summary of a long report or a slide deck without launching Office or Acrobat.
  • Contract and version reconnaissance – Compare multiple contract drafts or quotes quickly to spot differences in dates, parties, and key clauses.
  • Hiring and procurement – Batch-review up to five resumes or vendor quotes and extract highlights for a first-pass filter.
  • Content creation lift – Auto-generate FAQs or extract key points from manuals to accelerate knowledge base drafting.

These are assistive features: Copilot produces starting points and summaries that speed human review rather than replace it. Microsoft and other observers emphasize that outputs are not authoritative legal, financial, or medical analysis and should be validated in high-stakes contexts.

What Microsoft Did Right

  • Flow-first integration – Putting Copilot actions in the right-click menu and taskbar OneDrive flyout is a subtle, powerful UX win: it reduces friction and aligns AI assistance with where users already work.
  • Focused scope for reliability – By starting with text-first formats and a five-file cap, Microsoft narrows the engineering surface and boosts chances of predictable, useful results. The 150 MB practical limit keeps processing manageable for web-based models.
  • Multi-surface parity – The functionality mirrors OneDrive web features (Summarize, Q&A, Compare), giving users a consistent experience whether they start from the browser or the desktop.
  • Immediate productivity wins – For teams that routinely triage documents, the feature reduces time spent opening and closing files—a small interaction cost that compounds into real savings.

Risks, Caveats, and Governance Considerations

Embedding cloud AI directly into file management introduces new considerations IT teams and privacy-conscious users must weigh.

Data Residency and Cloud Processing

Copilot file actions invoked from File Explorer are processed in Microsoft’s cloud services, not locally. That means file contents are transmitted to Microsoft’s servers for analysis, raising questions for organizations with strict data residency, sovereignty, or contractual obligations. Administrators should verify processing locations and Purview protections for Copilot before broad enablement.

Licensing and Entitlement Nuance

Consumer Microsoft 365 Family licensing has an owner-versus-member nuance: the billing owner may have different Copilot entitlements than other family members. Commercial tenants may require specific Copilot or Microsoft 365 Copilot licenses. Rollout timing can vary by tenant and region.

Sensitive Content and Auditing

Even though Copilot respects OneDrive and SharePoint permissions (users can only act on files they already can access), the act of running Copilot should be treated like any other data operation in the audit trail. Logs of who ran Copilot, when, and on which files become important for eDiscovery and incident response. Organizations should consider including Copilot interactions in their logging and compliance workflows.

Model Hallucination and Overconfidence

Copilot’s summarization and comparison outputs are powerful but not infallible. Summaries may omit nuance; comparisons may highlight differences but not replace legal redlines or line-by-line review. For high-stakes content (contracts, clinical notes, tax filings), human-in-the-loop validation remains essential.

Unsupported Media and Scale Constraints

If your workflows rely on images, recorded meetings, videos, or very large files, the current feature set won’t help yet. Microsoft has signaled plans to expand support for media and larger files, but teams should not depend on those capabilities until availability is confirmed. The present size guideline (~150 MB) and the five-file cap are practical bounding factors for bulk analysis.

Technical Verification: What We Checked

Key technical claims and limits were verified against Microsoft’s OneDrive Copilot support documentation and independent reporting, including ZDNET’s hands-on testing. The list of supported file formats, the five-file maximum, the cloud-processing model, and the size recommendation are all explicitly documented. Independent coverage of the File Explorer integration appears in outlets tracking Windows features and privacy implications. If any of these details matter to compliance, privacy, procurement, or contract negotiation, validate the specifics against Microsoft’s live support pages or your Microsoft account team before enabling at scale. The cloud, rollout windows, and licensing language can change as Microsoft broadens availability.

Recommendations for IT Admins and Power Users

  • Review licensing and entitlements – Confirm which users (owner vs. members in Family plan, commercial Copilot license holders) can run Copilot file actions.
  • Pilot with non-sensitive data – Start with public or low-risk document sets (templates, vendor quotes) to measure accuracy and workflow gains. Track how often outputs require human edits.
  • Update logging and eDiscovery playbooks – Treat Copilot invocations as audit-worthy events and ensure logs capture who invoked the action, which files were processed, and timestamps.
  • Draft acceptable-use guidance – Tell users what to avoid (e.g., running Copilot on classified, PHI, or otherwise regulated content) until you can validate processing residency and protection levels.
  • Train users on prompt design – Teach how to ask specific questions and add context so Copilot returns the most useful summaries and comparisons.

Hands-On Examples and Prompts That Work Well

  • Executive triage: “Summarize this 60-page report in three bullet points focusing on recommended actions and deadlines.”
  • Contract triage: Select three drafts and run “Compare files,” then ask: “Which clauses change payment terms and what are the different notice periods?”
  • Resume screening: Select up to five CVs and ask: “List each candidate’s most relevant experience for a senior project manager role, including years of experience and certifications.”
  • Knowledge base creation: On a long manual, select Create an FAQ and refine: “Create five FAQs for a new user installing this product, include short step-by-step answers.”

What to Expect Next

Microsoft has framed this as the initial desktop surface of OneDrive Copilot, with explicit signals that format support and limits will expand. Expect iterative updates that:

  • Broaden supported file formats to include images, meeting recordings, and OneNote.
  • Raise the multi-file cap beyond five and increase the supported file-size ceiling.
  • Extend similar Copilot actions into SharePoint document libraries and possibly enhance offline or device-local capabilities for Copilot Plus PCs with NPUs (where some AI workloads can run locally).

Because rollouts are staged by tenant, region, and client version, availability will continue to be gradual—confirm your environment’s update cadence and OneDrive client version if you’re waiting for the feature.

Final Assessment

Putting Copilot actions into File Explorer is a practical, well-scoped productivity improvement that aligns with how people actually manage files on Windows. For text-heavy tasks—contract triage, quick report summaries, multi-document Q&A—Copilot in File Explorer delivers tangible time savings and reduces the need to switch to a browser or open multiple apps.

However, the integration is not a drop-in replacement for careful human review, and it introduces governance questions that organizations must treat seriously: cloud processing, auditability, and licensing boundaries are the most important of these. Until image, audio, and very large-file scenarios are supported and processing guarantees are more explicit, Copilot File Explorer actions should be treated as a productivity assistant rather than an authoritative source.

For everyday Windows users and small teams already working in OneDrive, the feature is worth trying now—but IT teams should pilot deliberately, update policies, and verify compliance controls before wider enablement. Microsoft’s move is a clear example of incremental AI integration that favors convenience and discoverability. It reduces friction for busy users and points the way toward a future where operating systems surface intelligent, context-aware helpers at the point of action—provided organizations and individuals treat the outputs with appropriate caution and verification.