What’s actually slowing this PC down?
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Short answer: the Copilot app on Windows can search supported files on your PC, including files synced from OneDrive. Microsoft 365 Copilot can use work files and other Microsoft 365 data when your account, license, permissions, and organization’s settings allow it. Neither label means Copilot automatically has access to every file you can imagine: the product surface and route you use matter.
How their file access differs
“Copilot” can refer to several experiences. The Copilot app on Windows offers device-oriented file search. Microsoft 365 Copilot refers to experiences in Microsoft 365 that can use files and other work data through Microsoft 365, when organizational grounding is available. Microsoft 365 apps also support workflows where you attach or select a file directly.
So the useful distinction is not simply “local files versus cloud files.” Windows search can include OneDrive-synced files, while Microsoft 365 file workflows can use selected files or, with the right work account and license, authorized organizational data.
| Comparison | Copilot app on Windows | Microsoft 365 Copilot |
|---|---|---|
| Typical file context | Files on the Windows device, including OneDrive-synced files. Microsoft’s Windows Copilot documentation | Work files and other Microsoft 365 content when organizational grounding is supported by the account, license, and settings; selected or attached files in supported flows. Microsoft 365 Copilot overview |
| Common route | File Search, with file-search and file-read access controlled in the Windows app settings. Windows Copilot documentation | Work-data grounding, Microsoft 365 app workflows, OneDrive file selection, or a file explicitly attached or referenced, depending on the experience. Microsoft 365 Copilot overview |
| File and task limits | Microsoft lists .docx, .xlsx, .pptx, .txt, .pdf, and .json as readable formats. Broad file search does not mean every file type can be read. Windows Copilot documentation | Formats and operations vary by app and task. Personal OneDrive question-and-compare workflows have their own requirements and limits. OneDrive Copilot documentation |
| What controls access | Windows app file-search and file-read settings, as well as the files available on the device. Windows Copilot documentation | Account and license, existing organizational permissions, admin configuration, and applicable security and compliance protections. Microsoft 365 Copilot privacy and protections |
What the Copilot app on Windows can do with PC files
Microsoft describes file search in the Windows Copilot app as a way to find and open files and ask questions about their contents. It can include files synced from OneDrive, so a cloud-synced file may be available through this device-oriented route. Microsoft’s listed readable formats are .docx, .xlsx, .pptx, .txt, .pdf, and .json. These are the documented readable types, not a promise that every file extension Copilot can locate is also readable.
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- Built-in AI Companion – Work smarter, create freely, and communicate with confidence—Copilot[5] on Windows 11 is always there to help.
The app also has Windows-oriented capabilities such as screenshots, Copilot Vision, viewing web content, and guidance for Windows Settings. Those features are distinct from Microsoft 365’s access to organizational data; having the Windows app does not itself establish that your work account has Microsoft 365 Copilot grounding.
To review whether Windows file access is enabled, open the Copilot app and check its settings for file-search and file-read access. The precise setting labels or availability may vary with the app version and configuration. Microsoft’s Windows Copilot guide describes the feature and settings.
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What Microsoft 365 Copilot can use
In an eligible work or school experience, Microsoft 365 Copilot can ground responses in organizational data available through Microsoft 365. That can include files and other work content, but only within the account’s access rights and the organization’s configuration. Microsoft describes Copilot as grounding responses in work data, the web, or content attached to a prompt; these are different sources, not a blanket grant to browse all company files. Microsoft 365 Copilot overview
A basic chat experience or access without the applicable Copilot add-on does not necessarily include the same Microsoft Graph grounding as a licensed work Copilot experience. Some tasks may still work if you attach a file or use a specific app feature, but that should not be confused with broader organizational search. Your Microsoft 365 admin and the license assigned to your account determine which work-grounded capabilities are available. Microsoft’s licensing and product overview
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Personal Microsoft 365 files
Microsoft also documents Copilot use with files in OneDrive and Microsoft 365 apps under eligible personal plans. The supported tasks and file formats differ across Word, Excel, PowerPoint, OneNote, and Outlook. For the documented personal-file workflow, a local file path is not supported: the file must be uploaded or hosted in the cloud. Microsoft’s personal Microsoft 365 Copilot documentation
OneDrive file questions and comparisons
OneDrive has specific Copilot workflows for asking questions about files, getting summaries, and comparing selected files. In the documented question and comparison flows, you can select up to five files. Microsoft lists eligible personal plans or a work/school account with a Copilot license as requirements; availability is rolling out, so the feature may not be available to every user or in every location. The documented question and compare workflows do not support videos or images. Microsoft’s OneDrive Copilot instructions
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- A PREMIUM PERFORMANCE LAPTOP — Ready for work, school, and creativity. Built for busy days, big projects, and nonstop multitasking. Run video calls, school and work apps, 20+ browser tabs, and AI tools at the same time without slowing down.
- WITH AI BUILT IN — With a dedicated AI chip (Qualcomm Snapdragon X2 Elite), this Copilot+ PC[5] on Windows 11 helps you work smarter and faster. Prompt, create, and automate with ease - ready for even your most demanding tasks.
- A 15" TOUCHSCREEN YOU'LL ACTUALLY USE — Sharp colors, real detail, smooth 120Hz scrolling on the PixelSense touchscreen[1] with LCD display[2]. Tap, scroll, or pinch to zoom - whichever feels right for streaming, editing photos, or daily work.
- 19 HOURS OF BATTERY (LEAVE THE CHARGER) — Up to 19 hours of video playback[3] on a single charge. Work from a coffee shop, take it to class/work, or binge an entire season on a long flight — it'll keep up.
- Two USB-C / USB4[4] ports and a microSD card reader for fast charging, big file transfers, or hooking up to three 4K monitors when you want a full desktop. Wi-Fi 7 keeps you online and fast wherever you are.
This is a selected-file route: choosing files for a question or comparison is not the same as enabling Copilot to search an entire organization’s content. The available route depends on whether you are using OneDrive, a Microsoft 365 app, the Windows Copilot app, or a licensed work Copilot experience.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Permissions and data protections still apply
Microsoft says Microsoft 365 Copilot operates within the Microsoft 365 service boundary and honors existing access controls. Its ability to discover or use SharePoint and OneDrive content can be affected by sharing and membership permissions, discovery settings, sensitivity labels, and information-protection policies. Some sensitivity permissions can prevent Copilot from extracting or interacting with file content. Microsoft 365 Copilot privacy and protections
Best Value
- Brilliant Display – Stunning 13.8" PixelSense touchscreen[1], with brilliant LCD display[2], unleashes luminous whites, deeper blacks and colors so richly saturated bringing vivid life into every frame – perfect for work, school, streaming and creative tasks.
- Power that lasts all day – With 20 hours of battery life[3], the new Surface Laptop powers through your entire day, so you can create, work and stream from morning to night without reaching for a charger.
- Work at the speed of your ideas – Built with the latest Qualcomm Snapdragon X2 Elite (12 Core) processors, Surface Laptop delivers fast, AI‑accelerated performance—making it the most powerful Surface laptop for everything from multitasking to demanding workloads.
- The ports you need – Charge on-the-go, transfer data fast, or create the ultimate desktop set up with two USB-C / USB4[4] ports.
- Built-in AI Companion – Work smarter, create freely, and communicate with confidence—Copilot[5] on Windows 11 is always there to help.
For organizations, that means a Copilot response should reflect what the signed-in user is allowed to access, not confer new rights. Admin policy and information-protection settings can further limit what Copilot can use, even when the user has a Copilot license.
Which route should you use?
- To locate or ask about a supported file on your Windows device: use File Search in the Copilot app on Windows, and check its file-search and file-read settings.
- To ask about a few specific OneDrive files: use the OneDrive Copilot workflow if it is available for your plan and account; select the files explicitly.
- To work across authorized company files and Microsoft 365 content: use the Microsoft 365 Copilot experience assigned and configured by your organization.
- To analyze a file when broad grounding is unavailable: check whether the app or chat flow supports attaching or selecting that file. For personal Microsoft 365 file workflows, the documented route requires cloud-hosted or uploaded files rather than a local path.
If a file is not found or its contents cannot be used, check which Copilot surface you opened, whether the file is in that surface’s supported location and format, whether the relevant setting or license is enabled, and—at work—whether your permissions or organization policy allow access.
Quick Recap
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