1m

.1m1M

Meta · 2023

Developer
Meta
Category
Documents
MIME Type
application/vnd.1m
First Released
2023
Open Format
No
File Signature
Not publicly documented
At a Glance
.1m
1M

1M is a proprietary file format used by Meta for storing rich-media messages and chat logs within their business communication platforms.

Reviewed on May 4, 2026
Compression
Compressed
Transparency
N/A
Editability
Low
Best for
Business chat archiving

Key Features

  • Proprietary binary format for efficient data storage.
  • Designed for rich-media messages and chat logs.
  • Includes metadata like timestamps and participant information.
  • Optimized for Meta's professional communication ecosystem.

Best For

  • Comprehensive archiving of business communication.
  • Preserving rich-media content within Meta platforms.
  • Seamless data exchange between Meta's collaboration tools.

Less Ideal For

  • Sharing with users outside the Meta ecosystem.
  • Long-term, cross-platform compatibility.
  • Open-source project integration.
  • General document sharing or editing.

Common Use Cases

  • Archiving business conversations and chat history.
  • Storing multimedia content shared within team chats.
  • Exporting communication logs for compliance or review.
  • Integrating chat data into other Meta business applications.

How to Open It

  1. Open .1m files exclusively within Meta's official communication applications (e.g., Meta Chat, Meta Workspace).
  2. Ensure you are logged into the correct Meta account associated with the file.
  3. These files are not designed for direct user editing or opening in standard text or media viewers.

What is a .1m file?

The 1M file format is a proprietary format developed by Meta, primarily for use within their professional communication and collaboration tools. It is designed to store rich-media messages, chat logs, and associated metadata, enabling seamless integration with platforms like Meta Chat and Workspace. The format aims to balance efficient storage with the need to preserve detailed interaction history for businesses. This allows for robust archiving and retrieval of important conversations and shared content. While not publicly documented, it is integral to Meta's ecosystem for business communication.

Programs That Open .1m Files

PlatformProgram
WindowsMeta ChatFreeOfficial
Meta WorkspaceFreeOfficial
macOSMeta ChatFreeOfficial
Meta WorkspaceFreeOfficial
AndroidMeta ChatFreeOfficial
iOSMeta ChatFreeOfficial
Web BrowserMeta Chat WebFreeOfficial

Common Problems with .1m Files

⚠️ Cannot open .1m file on a non-Meta platform.
As a proprietary format, .1m files can only be opened by specific Meta applications. There are no public converters available.
⚠️ Difficulty accessing historical chat data.
Ensure you are using the correct Meta account and version of the application where the data was originally created. Check for updates to the Meta application.

Frequently Asked Questions

Is the .1m file format open source?

No, the .1m format is proprietary to Meta and its internal applications.

Can I convert .1m files to a common format like PDF?

There are no official or publicly available tools to convert .1m files to other formats due to its proprietary nature.

What kind of data is stored in a .1m file?

.1m files typically store rich-media messages, chat logs, timestamps, participant information, and other metadata relevant to Meta's communication platforms.

Technical Details

The 1M format is a binary format, likely employing compression techniques to optimize storage size. It's structured to encapsulate various data types including text, images, videos, and metadata such as timestamps and sender/receiver information. As a proprietary format, its internal structure is not publicly available but is optimized for rapid serialization and deserialization within Meta's applications.

Did You Know?

The '1M' in the file extension likely stands for '1 Message' or '1 Meta' depending on internal naming conventions.
This format is part of Meta's ongoing effort to integrate and manage business communications across its professional tools.

Security Information

As a proprietary format used within Meta's ecosystem, .1m files should be treated with the same security considerations as any sensitive business data. Ensure you are using official Meta applications and are logged into secure accounts to access and manage these files.

Related Extensions