Opening IMM Files

The IMM file type is primarily associated with IncrediMail.

IMM	File extension: IMM
	File type:	message file

What is an IMM file?

IMM files mostly belong to IncrediMail. IMM files are not a single standard format. They can contain different types of data depending on their origin.
Email messages:
Some IMM files store email content. For example, one variant is the Imagine Mail file used by Imagine IT iMail (also known as the SurgeMail email file format). Other versions are used for IncrediMail email messages (IncrediMail), Yahoo! Mail messages (Yahoo Mail), or even Microsoft Outlook email messages.
Microscope images:
Another form of IMM file is an Olympus microscope image. These files use the Microsoft Compound format and are opened with specialized software such as the IMM Viewer; more details are available at this site.
Software modules:
A different use is found in the Intra-mart Module variant. These are packaged with a ZIP-based approach and can also appear as mind map files (iMindMap) linked to FreeMind, as noted on the Intra-mart webpage.
FilExt.com note: Each usage has its own internal structure. To view an IMM file, determine its source and use the matching application or viewer.

How can I open an IMM file?

You need a suitable software like IncrediMail to open an IMM file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your IMM file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a IMM file directly in the browser:. Just drag the file onto this browser window and drop it.

Online IMM Text Viewer

Choose your .imm file to analyze

or drag and drop it here

Online File Viewer

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IMM file format:

To find out what program is needed to open IMM files, you need to determine the file format. Often, the file format can be deduced from the file extension or the initial bytes (called the signature). If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. So a detailed analysis of a file is vital in order to determine the format and the associated program. Our analysis of the IMM files produces the following result:

IMM is not that commonly used as a file extension. This file type is used by a few programs, each with its own file format. The two most common formats are as follows:

• 20% of all IMM files have the same signature Re. The contents of these files can even be read by a human. The files are often between 110 KB and 10 MB in size. Certain words are almost always found in the files, such as Received: from, Return-Path, with, ESMTP and com. Such files are related to person-related data.
• 15% of all IMM files store the data in the MIME file format. MIME is short for Multipurpose Internet Mail Extensions. It is an Internet standard that extends the format of email messages to support Unicode and attachments. The content consists of readable text data, which can be read using a text editor. The average file size is 27 MB with most files being between 58 KB and 220 MB in size. The following keywords are characteristic: Date, MIME-Version: 1.0, Message-Id, Content-Type: Multipart/related;, charset, type, boundary and Time. The following filename is common: Sent Items.imm.

All the rest of the IMM files (65%) have different formats, often, for example, DOC, ZIP and Subject. Tagged as session or deleted. If you want to find out what your IMM file contains, drag and drop it onto this page.