Opening a 91 File

The 91 file type is primarily associated with WordPerfect.

91	File extension: 91
	File type:	document file

What is a 91 file?

91 files mostly belong to WordPerfect. *.91 files are a legacy file format used by WordPerfect 5.1. They were created for the DOS version of WordPerfect and store complete word processing documents with embedded formatting codes.
These files contain text and control codes that manage page layout and formatting in a way specific to older systems.

Primary purpose: Serve as a container for text and related formatting instructions in WordPerfect 5.1.

Legacy use: They were optimized for DOS, ensuring text alignment and complex formatting that modern text files do not support in the same way.

They carry internal commands that many newer word processors have difficulty interpreting directly.

FilExt.com tip: If you need to open or convert a *.91 file, using WordPerfect (preferably a version that supports DOS formats) or a specialized conversion tool is recommended.
Files with the extension 91 are often also jpg images or pdf documents, but zip compressed archives or medical images such as DICOM are also common. Use the Online 91 File Viewer on this page to find out the file format being used, and to view your 91 file.

How to open 91 files

You need a suitable software like WordPerfect to open a 91 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 91 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a 91 file directly in the browser:. Just drag the file onto this browser window and drop it.

Online 91 Text Viewer

Choose your .91 file to analyze

or drag and drop it here

Online File Viewer

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91 file format:

A file format defines how the data in the file is structured. The initial characters of a file are called signature, sometimes also referred to as "magic bytes". The signature can be used to infer the file format. However, different programs can use the same file extension, and file extensions can be assigned incorrectly. If there are problems opening a file, you must first determine the file format used. In the following you will find our evaluation of the 91 files:

91 is rarely used as a file extension and includes different formats for different programs. The two most common formats are as follows:

• 40% of all 91 files internally utilize the WordPerfect file format. WordPerfect is a word processor now owned by Corel and has a long history that began in the 1980s. It may contain formatted text, tables, charts, drawn objects, and images. These files contain text and words as well as binary data. Most of these files are 3 KB to 58 KB in size. The file type was used 20 years ago. The keywords Courier are typical for these files.
• 10% of all 91 files are using the well-known PDF file format to store the data. 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. They consist of illegible, cryptic characters. The files are often between 23 KB and 590 KB in size.

All other 91 files (50%) have different formats, often e.g. ELF. Sometimes used for brief or slps. Just click the "Choose your .91 file to analyze" button on this page to find out what your 91 file is.