.P21 File Extension

File Type:
Express STEP Data Model File

Having trouble opening .p21 extension? Don't panic! This page explains what p21 files are as well as suggests programs you may use to open p21 files. You can download these programs through this page.

What is a P21 file?

P21 file extension has Express STEP Data Model file type, which is associated with the "3d image files" category.

These files in the 3D model format allow developers to exchange and present 3D product information. P21 files use ASCII text formatting. These files are used for integration purposes and industrial automation systems. Application Integrated Model files, as well as Modular Integrated Model files, must have the .STP extension.   

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

p21 file icon
File Type:
Express STEP Data Model File
3D Image Files

How to open P21 file?

Double click the p21 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 .p21 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 p21 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 p21 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 P21 files

  • Windows Windows
    • LKSoft JSDAI for Eclipse LKSoft JSDAI for Eclipse

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 p21 file as well. Download Universal File Viewer for your OS.

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