163

.163 — 163 File

NetEase · 2000s

Developer
NetEase
Category
Documents
MIME Type
application/vnd.163-file
First Released
2000s
Open Format
No
File Signature
Not publicly documented or consistently identified
At a Glance
.163
163 File

A .163 file is a proprietary document format used by NetEase, often for email messages within their services.

Reviewed on May 2, 2026
Compression
Varies
Transparency
No
Editability
Low
Best for
NetEase email storage

Key Features

  • Proprietary format tied to NetEase services.
  • Primarily used for storing email data.
  • Binary structure, not human-readable.
  • Limited interoperability with external applications.

Best For

  • Native storage within the NetEase ecosystem.
  • Ensuring data integrity for NetEase-specific services.
  • Proprietary archiving of email content from NetEase.

Less Ideal For

  • General email exchange with other providers.
  • Cross-platform compatibility.
  • Long-term archival outside of NetEase services.
  • Sharing with users of different email clients.

Common Use Cases

  • Storing email messages from NetEase Mail.
  • Archiving user data within NetEase applications.
  • Facilitating data exchange between NetEase services.

How to Open It

  1. Attempt to open using the NetEase Mail client if the file is an email.
  2. Explore if other NetEase applications that generated the file offer an import or open function.
  3. If conversion is necessary, search for specialized third-party tools, though availability is rare and risks exist.
  4. Consider contacting NetEase support for guidance if the file is critical.

What is a .163 file?

A .163 file is a proprietary document format primarily used by the Chinese internet company NetEase for its various applications, most notably its email service. These files often contain email messages, attachments, or other data specific to the NetEase ecosystem. They are not designed for general use or compatibility with other email clients or software. If you encounter a .163 file, it likely originated from a NetEase service and may require specific NetEase software to open and interpret correctly.

Programs That Open .163 Files

PlatformProgram
WindowsNetEase MailFreeOfficial
macOSNetEase MailFreeOfficial
AndroidNetEase MailFreeOfficial
iOSNetEase MailFreeOfficial
Web BrowserNetEase Mail Web ClientFreeOfficial

Common Problems with .163 Files

⚠️ Cannot open .163 files with standard email clients.
Use the NetEase Mail client or associated NetEase applications, as .163 is a proprietary format.
⚠️ Difficulty finding a reliable converter for .163 files.
Due to the proprietary nature, official converters are rare. Look for specialized third-party tools cautiously or seek help from NetEase support.

Frequently Asked Questions

Is .163 a common file format for emails?▼

No, .163 is a proprietary format specific to NetEase's services and is not widely used for general email exchange.

Can I open a .163 file on any computer?▼

You can typically only open .163 files using the NetEase Mail application or their web client, as it's designed for their ecosystem.

Technical Details

The .163 file format is a binary format specific to NetEase's internal systems. It acts as a container for email data, potentially including headers, body content, and embedded attachments. Due to its proprietary nature, the internal structure and encoding are not publicly documented, making direct manipulation or conversion challenging without specialized tools.

Did You Know?

The '.163' extension likely derives from NetEase's popular email domain, 163.com.
These files are integral to NetEase's legacy services and continue to be used within their product suite.

Security Information

As a proprietary format, .163 files from untrusted sources could potentially contain malicious content. Always ensure you are using official NetEase software to open them and exercise caution with email attachments from unknown senders.

Related Extensions

.MSG