File Extension Library


.P21 File Extension

  • Category: 3D Image Files

What is an .P21 file?

.P21 file extension has been classified as 3D Image Files.

.P21 is Express STEP Data Model File

3D model format used for three-dimensional product data representation and exchange; saved in an ACSII text format specified by ISO 10303-21; used primarily for industrial automation systems and integration purposes.

NOTE: Express AIM (Application Integrated Model) and MIM (Modular Integrated Model) files must use the .STP extension.

How to Open .P21 file on different platforms

Open .P21 File on Windows

  • Right-click a .P21
  • Left-click "Open With" > "Choose another app"
  • Select the program that opens .P21 file and Select check box "Always use this app to open .P21 files" Press "Ok"

Open .P21 File on Mac

  • Right-click (or Ctrl + Left-click) the .P21 file
  • Click "Open With" > "Other.."
  • Then choose another program from the app list and press "Open"
  • Select check box "Turn on" for "Always open in app"

Open .P21 File on Linux

Right click on the .P21 file, choose "Open with" and select a program from the list above

Open .P21 File on iPhone

Select a file. If you don't see an application to open the .P21 file, tap "Share" and choose the right app.
Method 2
Save the file. Then open the app «Files». Touch and hold the file, then release your finger. You will see a black menu bar. After that tap "Share" and select an application.

Open .P21 File on Android

Tap the Settings icon on an Android smartphone, then select «Applications». Click the Settings icon in the upper right corner of the screen, to change the default apps.
If you want to open, edit, save or even convert .P21 files on Android, then your best bet is to download one of the dedicated apps available on Google Play.

How to fix problems with .P21 files

  1. You need to update the application that you normally use to open .P21 files. Only the latest version of the software supports the current .P21 file format
  2. You need to check the .P21 file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)