Filename Extensions
If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .proj

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

Below, you can find answers to the following questions:

  • What is the .proj file?
  • Which program can create the .proj file?
  • Where can you find a description of the .proj format?
  • What can convert .proj files to a different format?
  • Which MIME-type is associated with the .proj extension?
Poseidon for UML Project Information .proj file icon

Poseidon for UML Project Information

PROJ file is a Poseidon for UML Project Information. Poseidon for UML is a software application used to create models with the Unified Modeling Language.
Category: Data files
Application: Poseidon for UML
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
Poseidon for UML Project

Other types of files may also use the .proj file extension. If you have helpful information about .proj extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

General Project File
Steinberg WaveLab Workspace
SOCET SET Project File
Electric Quilt 3 Project
ArcInfo Projections Definition Data
Infinity Engine Projectiles Data
KiCad Project File
Binary Terrain Data
FEMFAT Result Protocol Data

The .proj filename extension is often given incorrectly!

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

prj (100), pro (1)

Can't open a .proj file?

If you want to open a .proj file on your computer, you just need to have the appropriate program installed. If the .proj association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.proj

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2003/2008/2012/2016, Windows 7, Windows 8, Windows 10, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android

Rate this page

5 / 5 based on 38 user ratings.