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Basic information about PROJ file

When there is a problem with opening files with the file extension PROJ（*.PROJ or *.proj）, you do not need a computer expert. In most cases, using the helpful suggestions of experts contained in our website as well as appropriate programs, you can solve the problem with the PROJ file yourself.

There are 4 file types using the PROJ file extension in our database. In the further part of this page, you will find detail information about all the PROJ file with their brief description and a list of programs that support PROJ file sorted by operating systems. The table below provides useful information about the PROJ file extension. It answers questions such as:
  • What is the PROJ file?
  • How to open a PROJ file?
  • What programs do I need to open a PROJ file?
  • What programs help to create and edit a PROJ file?
  • How to convert PROJ files to another file format?
  • How to convert another files to PROJ file format?


1.Detail information about PROJ file extension: Apple NeXT Interface Builder Project

File type Apple NeXT Interface Builder Project Category Misc Files
Developer Apple, Inc. File format N/A
Description PROJ file is a Apple NeXT Interface Builder Project developed by Apple, Inc.. PROJ filename suffix is mostly used for Apple NeXT Interface Builder Project files. Apple NeXT Interface Builder Project format was developed by Apple, Inc.. PROJ files are supported by software applications available for devices running Mac OS. Interface Builder is by far the most used program for working with PROJ files. Software named Interface Builder was created by Apple, Inc.. In order to find more detailed information on the software and PROJ files, check the developer’s official website.
Software programs that will open, edit or convert PROJ files

macOS		 Interface Builder


2.Detail information about PROJ file extension: Insight II NMR Project File

File type Insight II NMR Project File Category Misc Files
Developer N/A File format N/A
Description PROJ file is a Insight II NMR Project File.
Software programs that will open, edit or convert PROJ files

Linux		 Insight II


3.Detail information about PROJ file extension: Poseidon For UML Project Information File

File type Poseidon For UML Project Information File Category Misc Files
Developer N/A File format N/A
Description PROJ file is a Poseidon For UML Project Information File.
Software programs that will open, edit or convert PROJ files

Windows		 Poseidon for UML


4.Detail information about PROJ file extension: L3DT Project

File type L3DT Project Category 3D Image Files
Developer N/A File format N/A
Description PROJ file is a L3DT Project.
Software programs that will open, edit or convert PROJ files

Windows		 L3DT



Can't open a PROJ file?

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

”Can't open this file: example.PROJ”。

To open this file, you install one of the applications from the list of software programs that you found here, you should be able to open, edit or convert the file with the PROJ extension without any issue.


Where I can download the application that support PROJ file?

If you do not know where you can download the application from our list, click on the link (which is the name of the program), you will find more information there on the location where to download the required application. Most often they are the websites of software manufacturers.


How 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.


Can I change the extension of PROJ 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/open the file. The problem is, changing the file extension does not change the file format. Select a software program from our list and install it on your computer. If the file has not opened correctly, you have to look for a different software program from our list. Sometimes you have to repeat the operation several times.


What else may cause problems width open a PROJ file?

The reasons for the lack of the ability to open a PROJ file on your computer may be at least several. The easiest thing is to find a suitable application installed on your computer, which will open a PROJ file. If there is still something wrong, you might want to check:

  • Whether the PROJ file is damaged.
  • Whether the PROJ file is incorrectly linked in the registry entries.
  • Whether the PROJ file extension has been accidentally removed from the Windows registry.
  • Whether the installation of an application that supports the PROJ file format is incompletely.
  • Whether the PROJ file is infected.
  • Whether the drivers of the equipment used for opening a PROJ file are up to date.
  • Whether your computer has enough hardware resources to open a PROJ file.

If the PROJ file still not working with your software after eliminating the above shortcomings? That means that the problem is more complex and requires the help of a specialist.