File Cannot Open

Fix Form Response File Returning HTTP 200 OK Error

Maira Mehtab Sep 24, 2026 869 views

Question details

A downloaded file from a form response cannot be opened, instead returning an HTTP/1.1 200 OK response with Microsoft IIS headers, or the file appears damaged.

Product: Microsoft Forms / Microsoft 365
Device & OS: not provided
Scenario: Downloading and attempting to open a file submitted as an attachment via a form response.
Observed behavior: The file fails to open, is flagged as an unrecognized format, or displays raw server headers (HTTP 200 OK) rather than the actual document content.

Before you start

Verify that your internet connection is stable and ensure your web browser is fully updated before attempting to re-download the file.

Solution 1Recommended

Try a Different Web Browser or Network

Browser caching issues or local network proxy settings can sometimes corrupt file downloads, causing them to save in an unrecognized format.

Often, network configurations or browser extensions can intercept file downloads from secure servers, resulting in a damaged file payload despite the server returning a success code.

Switch Your Browser

Open a completely different web browser (such as Edge, Chrome, or Firefox) and log into your account to access the form.

Change the Network

Connect your device to a different Wi-Fi network or use a cellular hotspot to bypass any local firewall or proxy restrictions.

Re-download the File

Navigate to the form response page and attempt to download the file again. Check if it opens correctly.

Solution 2

Contact Microsoft 365 Support for Server-Side Errors

If the file fails to open both online and offline across different networks, the problem is likely a temporary server-side issue with Microsoft IIS.

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If server issues or software glitches prevent you from reliably opening form downloads in your current Office suite, consider switching to WPS Office. It is a free, lightweight, and powerful alternative that handles all standard document formats with ease.

1. Download the Software: Visit the official WPS Office website and click the free download button for your operating system.
2. Install WPS Office: Run the installer file and follow the quick on-screen setup instructions.
3. Open Form Responses: Right-click your downloaded form response files, select 'Open with', and choose WPS Office to view your data reliably.

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Frequently Asked Questions

What does HTTP/1.1 200 OK mean when downloading a file?

The HTTP 200 OK status code means the server successfully processed your request. However, if you see this as raw text inside a damaged file, it indicates that the server sent the success header but failed to attach the actual file contents.

Why do downloaded form response files appear damaged?

Files can appear damaged if the browser download is interrupted, if local network proxies modify the file headers, or if the server experiences a temporary failure while generating the file payload.

Can I recover or repair the damaged form file myself?

Typically, you cannot repair the file locally because the downloaded file does not contain the actual data. You must resolve the connection issue by trying a different browser/network or contacting your IT admin so they can address the server error.

Document & File Issues