A daily updated filename extension database!

REJ file extension

The table below provides useful information about the .rej file extension. It answers questions such as:

  • What is the .rej file?
  • What program do I need to open a .rej file?
  • How can the .rej file be opened, edited or printed?
  • How can I convert .rej files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Patch Reject File

REJ file is a Patch Reject File. GNU patch takes a patch file patchfile containing a difference listing produced by the diff program and applies those differences to one or more original files, producing patched versions. If patch cannot find a place to install that hunk of the patch, it puts the hunk out to a reject file, which normally is the name of the output file plus a .rej suffix.
REJ format description not yet available
Category: Other files
Application: GNU Patch
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
REJ aliases:
REJ related links:
REJ related extensions:
Diff Output

Other types of files may also use the .rej file extension.

🚫 The .rej file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

rdj, re, rei, rek, rem, ren, reu, rsj

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Backup Copy File
JCanyon Texture Data
C64 REU Image
Python Regular Expressions Source Code
Reason Module
Personal Backup Saved Task
Reason Module Interface
Fraunhofer EZRT Volume Data
BlackBerry Encrypted File

🔴 Can't open a .rej file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .rej file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .rej file extension, write to us!

🔴 Rate our REJ page

Please help us by rating our REJ page on a 5-star rating system below. (1 star is poor, 5 star is excellent)

3 of 5 stars (10 votes)
Thanks for voting!
Invalid vote.
Browser: Abbreviation Application Archive Audio Configuration Data Development Disk Image Document Ebook Font Game Data GIS Graphic Malware Multimedia Other Project Scam Unknown Video
This page is available in the following languages: Český Deutsch English Español Suomi Français Magyar Italiano 日本語 Nederlands Norsk Português Român Русский Svensk 中文