Opening I Files

The I file type is primarily associated with Adobe Acrobat Reader.

I	File extension: I
	File type:	document

What is an I file?

I files mostly belong to Adobe Acrobat Reader. I files are not a single standard file format but rather a label used by different systems for internal processing.
In some cases, a I file contains PDF content. In these situations the file is actually a digital document. It is handled much like a regular PDF, but the extension indicates that it might be an intermediate or unrenamed version produced during processing. You can view such files using Adobe Acrobat Reader.
In other cases, I files are created during the C/C++ compilation process. They are the output of the preprocessor, which means they contain expanded source code after evaluating macros and include directives.
Below are a few points to consider when handling a I file:

Examine the contents: Open the file in a text editor to check if it contains text code or if it appears to be a formatted document.

Match the application: If the file displays like a PDF, use Adobe Acrobat Reader. If it is human‑readable source code, a plain text or code editor is best.

Renaming tip: Sometimes renaming the file with a .pdf extension can prompt your viewer to open it as a document.

Developer insight: For those in software development, these files can help in debugging or understanding how source code is transformed during preprocessing.

More specifics for preprocessor files can be found at the GCC website.
FilExt.com tip: Understanding these uses helps in choosing the right tool to open and view the file depending on its actual content.

How can I open an I file?

You need a suitable software like Adobe Acrobat Reader to open an I 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 I file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a I file directly in the browser:. Just drag the file onto this browser window and drop it.

Online I Text Viewer

Choose your .i file to analyze

or drag and drop it here

Online File Viewer

✈

Read our privacy guarantee in Filext’s terms and privacy policy

Please allow ads on our site

This helps us keep our servers running. Then re-upload your file to view it.

Click here to see how to disable the ad blocker for filext.com

I format details:

If you know the file format, you can also find out how to open or edit the file. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. Knowledge is power - this also applies when dealing with unknown or faulty files. In the following you will find our evaluation of the I files:

As a file extension, I isn't very common and includes very many different file formats. However, the following two file formats are common:

• 15% of all I files use the popular PDF file format. PDF is short for Portable Document Format, is a file format to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. The content consists of illegible binary data, which can only be read and interpreted by the associated programs. Most of these files are 15 KB to 830 KB in size.
• 7% of all I files are based on the zip format, i.e. an I file contains several compressed files. I files contain from 1 to 18 compressed files. A little tip: If you rename the file extension to .zip and then double-click, you will see the included files and images. Most of these files are 15 KB to 160 MB in size.

All other I files (78%) have no uniform format, the following 6 formats exist: BDSDI. Files like these are sometimes linked to data or hist. Drag & drop your file here to see the file format and a preview of your I file!