.BNS File Extension

File Type:
Portal Bonus Map Script

Having trouble opening .bns extension? Don't panic! This page explains what bns files are as well as suggests programs you may use to open bns files. You can download these programs through this page.

What is a BNS file?

Bns file extension has Portal Bonus Map Script file type, developed by Valve, which is associated with the "game files" category.

These are game files required to run Portal, an action puzzle solving game. They hold information about the map in Portal (.BSP files) in a plain text script. In .BNS files you can find thumbnail image file references, map comments, location names, and available challenges. BNS files come in one package with .BMZ files (custom game maps for Portal).  

To learn how you can open the given file, read the information below.

bns file icon
File Type:
Portal Bonus Map Script
Game Files

How to open BNS file?

Double click the bns file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .bns extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 1: Fix file association errors

Follow these steps in order to automatically fix the bns extension associations' problem in no time:

  • Step 1: Click on "Download Solution" to download automatic tool provided by WikiExt.
  • Step 2: Click "Start Scan" to identify all potential issues.
  • Step 3: Review scan results and click "Fix Items".

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With: Windows XP, Vista, 7, 8/8.1, 10

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the bns file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open BNS files

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the bns file as well. Download Universal File Viewer for your OS.

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