Opening a PRJ File

The PRJ file type is primarily associated with ArcGIS.

PRJ	File extension: PRJ
	File type:	projected coordinate system file

What is a PRJ file?

PRJ files mostly belong to ArcGIS by ESRI. PRJ stands for Project file. PRJ file format is a data file type associated with multiple software such as Microsoft Visual Studio and Autodesk AutoCAD.

Main Use: Microsoft Visual Basic is a programming language used by Microsoft Visual Studio for creating a software interface built around a simple graphical environment. Autodesk AutoCAD is a computer-aided design application used for multiple design purposes such as creating blueprints for buildings, flyovers and integrated circuits. Both Microsoft Visual Studio and Autodesk AutoCAD use PRJ files to save project information, settings and references to other files and resources used by the project. Advanced Integrated Multidimensional Modeling Software (also known as AIMMS) uses PRJ file format in Windows and Linux systems to save project data used in the creation of operations models. The saved information includes project settings other user-interface components such as menu items. Various other software also uses PRJ files to store project related data such as music, document, 3D image settings, locations of saved windows and other raw data.
Other Uses: Different projections are used against geodetic datasets such as ESRI ArcGIS/ArcView shapefiles and Geo TIFF files. The projection definitions suitable for different geodetic datasets are saved in PRJ files. The data is the PRJ files is stored in the ASCII-notated WKT format. Open repositories of all PRJ projection definition files can be found on the web.

How do you open PRJ files?

You need a suitable software like ArcGIS to open a PRJ file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your PRJ file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a PRJ file directly in the browser:. Just drag the file onto this browser window and drop it.

Online PRJ Text Viewer

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Programs that open and convert PRJ files:

ArcGIS by ESRI
See the previous paragraphs to learn more about the main application. PRJ files are often referred to as ArcGIS gis because this type of file is primarily created or used by this software.
3ds Max (3ds Max project) by Autodesk
3ds Max is a software for 3D modelling, rendering, and animation from Autodesk. The PRJ file format stores a 3ds Max project. This file format is classified as 3D Image. Related links: 3ds Max on Wikipedia, 3ds Max 2020 Help, PRJ Files in 3ds Max, 3ds Max Overview Video, 3ds Max Knowledgebase
AIMMS Developer (AIMMS project) by AIMMS
AIMMS Developer is an Integrated Development Environment (IDE) for developing decision support applications and advanced planning systems. AIMMS stands for (Advanced Interactive Multidimensional Modeling System). The PRJ extension is associated with a project in AIMMS Developer. It was replaced with the AIMMS format in AIMMS 4. This file format is classified as Developer. Related links: AIMMS User Guide, PRJ Files Mentioned in AIMMS Release Notes, PRJ and AIMMS files Mentioned in AIMMS 4 Release Notes, PRJ Files Mentioned in Book About AIMMS 3.8, PRJ Files Mentioned in Book About AIMMS 3.10
AutoCAD (projected coordinate system file) by Autodesk
AutoCAD is a computer-aided design (CAD) and drafting software used to create 2D and 3D drawings. It supports importing and exporting data in several formats used by the software ArcGIS. These formats include PRJ, which defines a shapefile's projected coordinate system. This file format is classified as GIS. Related links: AutoCAD on Wikipedia, PRJ File Import in Autodesk Help, PRJ File Export in Autodesk Help, How to Import PRJ Files in AutoCAD, PRJ Files Mentioned in Autodesk Forum Discussion
AwpHelp (AwpHelp project) by Association of Windows Programmers
AwpHelp is a software for creating Windows Help files or for any document that contains hypertext. It can also be used as a Rich Text Editor. The PRJ file stores an AwpHelp project. This file format is classified as Developer. Related links: Main Website in French, AwpHelp on Helpmaster
Café (Café project) by Symantec
Café is a discontinued Integrated Development Environment (IDE for the Java programming language. It was developed by Symantec (now NortonLifeLock) in 1996 and formed the basis of Visual Café. The PRJ file stores a Café project. This file format is classified as Developer. Related links: Café FAQs, PRJ Files Mentioned in Café Tutorial, Café Download Link, PRJ Files Mentioned in Java Tutorial, Visual Café on Wikipedia
FireFly SDK Designer (FireFly Visual Designer project) by PlanetSquires Software
FireFly Visual Designer is a rapid application development environment for the FreeBASIC computer language. It was previously developed for PowerBASIC. The PRJ file format stores a project created in FireFly Visual Designer. This file format is classified as Developer. Related links: FireFly Visual Designer Download and Other Links, FireFly Topic on PowerBASIC Forum, FireFly Topic on FreeBASIC Forum
HitPlayer (advanced playlist file) by Aztec Radiomedia
HitPlayer is an audio player from Aztec Radiomedia that is now discontinued. The PRJ extension is associated with a HitPlayer advanced playlist file. This file format is classified as Misc.
Maestro (Maestro project directory) by Schrödinger
Maestro is a molecular modeling and visualization software from Schrödinger. PRJ is the extension for a project directory in Maestro. This folder stores data for the project. This file format is classified as Misc. Related links: Maestro Getting Started Guide, PRJ Extension Mentioned in Maestro Support Article, Support Article About PRJ Issue, Maestro Quick Start Video
Monarch (Monarch model project) by Altair
Monarch is a data preparation software from Altair that was previously developed by Datawatch (now acquired by Altair). Older versions of Monarch saved models in the PRJ format. PRJ has been replaced by the binary DPRJ format. This file format is classified as Data. Related links: Monarch on Wikipedia, Archived Monarch Product Page from Datawatch's Website, PRJ Files Mentioned in Monarch Learning Guide, Convert PRJ to DPRJ, Monarch Overview Video
Multi-Edit (Multi-Edit project) by Multi-Edit Software
Multi-Edit is a text editor specialized for programming. The PRJ format is associated with a Multi-Edit project. It was replaced by the MEP format in Multi-Edit 9. This file format is classified as Developer. Related links: Multi-Edit, Multi-Edit Manual, PRJ Files Mentioned in Multi-Edit 8 Manual, Forum Discussion Mentioning PRJ Files, Multi-Edit Tutorial
MyChip Station (MyChip Station project) by SELOCO
MyChip Station is a software for electronic circuit design and simulation from SELECO. The PRJ file format is associated with a MyChip Station project, which stores a circuit layout. This file format is classified as CAD. Related links: MyChip Station Tutorial Mentioning PRJ Files, MyCAD Product FAQs
PG4UW (PG4UW project) by Elnec
PG4UW is a common control program for all Elnec device programmers in Windows. The PRJ file format stores a PG4UW project. This file format is classified as Developer. Related links: PG4UW User Manual
Stylus Studio (Stylus Studio project) by Progress
Stylus Studio is an Integrated Development Environment (IDE) for XML editing. This file format is classified as Data. Related links: Stylus Studio on Wikipedia, Stylus Studio User Guide, Working with PRJ Files in Stylus Studio, Saving PRJ Files in Stylus Studio, Stylus Studio Video Overview
Turbo C (Turbo C project) by Embarcadero Technologies
Turbo C is an Integrated Development Environment (IDE and compiler that was developed by Borland for the C programming language. It was re-released by Borland's successor, Embarcadero Technologies, as freeware. The PRJ file stores a Turbo C project. This file format is classified as Developer. Related links: Turbo C on Wikipedia, Download Link for Turbo C, Turbo C User Guide, PRJ Files Mentioned in Forum Discussion, Turbo C on the Internet Archive
Visual Basic (Visual Basic project) by Microsoft
Visual Basic is an object-oriented Integrated Development Environment (IDE) from Microsoft. The PRJ file format stores a project created in Visual Basic. This file format is classified as Developer. Related links: Visual Basic on Wikipedia, PRJ Files Mentioned in Visual Basic Guide, Creating an IBM Cognos TM1 Project in Visual Basic
WaveLab (WaveLab project) by Steinberg
WaveLab is an audio recording and editing software from Steinberg. The PRJ format was used in older versions of the software to store projects, which were later named Workspaces. This file format is classified as Audio. Related links: WaveLab on Wikipedia, WaveLab Operation Manual, PRJ Files Mentioned in WaveLab 4.0 Operation Manual, WaveLab on YouTube, Article About WaveLab

PRJ file format:

The file format, which is the arrangement and type of data in a file, determines which program can open the file. The file format can be determined based on the file extension and the signature (the first few characters of a file). If the file extension or signature does not match the file format, errors will occur when opening or editing the file. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Below you will find our evaluation of the PRJ files:

The PRJ file extension is quite widespread and is used by a few programs, each with its own file format. But the following two file formats are common:

60% of all PRJ files belong to Shapefile Projection metadata. These files are text files, so they contain words and text. PRJ files are between 380 bytes and 510 bytes in size. It is a modern file type. The keywords DATUM, GEOGCS, PROJCS, SPHEROID, PRIMEM, Greenwich, UNIT, Degree, 6378137, PROJECTION, 0174532925199433, 257222101 and Zone are typical for these files. These files can be linked to export, transparent, mosaic, group, shape, teren, zone, boundary, polygon, alearg and topo.
5% of all PRJ files are based on the zip format, multiple files are compressed and combined into one PRJ file. A typical number of included files is 62. Customary file names are mimetype, \META-INF\file-version, \META-INF\metadata.json and \PROJECT\projectDescriptor.json. Tip: If you rename the file ending to .zip and then double-click it, you see the included files and images. A typical file size is 78 MB. The following keywords are characteristic: mimetype, application/pgx-project+zipPK and META-INF/. Such files sometimes refer to fotobuch, album and hoch.

The remaining 35% of all PRJ files are different files with different signatures, such as Borland Turbo C Project, MATLAB Compiler Project, 3D Studio Project, MADE Project/game, My House Project, Clarion Project, UTF-8, XML, SQL, config, Proj and KPVQ. Files like these are sometimes linked to fotobuch, district, album, line, jalan, kopie or poly. You can get all the details of your PRJ file by dragging it onto this page or by clicking the button "Choose your .prj file to analyze" above.

Technical Data for PRJ File Extension

File classification:

GIS

Related files:

pjr, cpg, dbf, shp, shx, sbn, sbx, prjz, qpj, g01, pserj, tfw, seeprj, zip, pgw, jgw, f01, vc0, rpj, ecw, dem, apr, lyr

Mime type:

text/xml, application/octet-stream, text/plain

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: UltraEdit.prj, AppName: UltraEdit-32 Professional Text/Hex Editor

ProgramID: prjfile
EXEFile: %SystemRoot%\system32\NOTEPAD.EXE %1

ProgramID: Proj.Document
EXEFile: C:\DOWNLO~1\CINTER~1\Quincy\Quincy\Quincy__\Quincy.exe /dde

ProgramID: ProtelProjectFile
EXEFile: %ProgramFiles%\Design Explorer 99 SE\Client99SE.exe %1

ProgramID: UltraEdit.prj
EXEFile: %ProgramFiles%\UltraEdit\uedit32.exe %1

ProgramID: projectnebula
EXEFile: C:\unzipped\nebula\nebula.exe %1

ProgramID: WaveLab.Project
EXEFile: %ProgramFiles%\STEINB~1\Wavelab\WaveLab.exe %1

ProgramID: myHouse.File.Old
EXEFile: %ProgramFiles%\DesignSoft\myHouse for Windows\myhouse.exe %1

ProgramID: UltraEdit.prj
EXEFile: %ProgramFiles%\IDM Computer Solutions\UltraEdit-32\uedit32.exe %1

ProgramID: quick3D.prj
EXEFile: %ProgramFiles%\quick3D Geo\quick3D.exe %1

ProgramID: MovieEditor.Document
EXEFile: %ProgramFiles%\Samsung\SAMSUN~1\MOVIEE~1.EXE %1

ProgramID: stylusstudiofile.prj
EXEFile: %ProgramFiles%\bin\Struzzo.exe %1

ProgramID: WaveLab.prj
EXEFile: %ProgramFiles%\WaveLab\WaveLab.exe %1

ProgramID: stylusstudiofile.prj
EXEFile: %ProgramFiles%\STYLUS~1\bin\Struzzo.exe

ProgramID: IDLprojectFile
EXEFile: %ProgramFiles%\RSI\IDL56\bin\bin.x86\idlde.exe

ProgramID: MovieEditor.Document
EXEFile: %ProgramFiles%\MOVIEE~1.EXE

ProgramID: WaveLab.prj
EXEFile: %ProgramFiles%\Steinberg\WaveLab\WaveLab.exe

ProgramID: PMaker.Project
EXEFile: %ProgramFiles%\fedora core 6\asm\pmaker.1.2.0.0.preview.6\pmaker.exe

ProgramID: ProtelProjectFile
EXEFile: %ProgramFiles%\Protel99\Client99SE.exe

ProgramID: EasyPC.Project
EXEFile: %ProgramFiles%\Number One Systems\Easy-PC\Epcwin.exe

ProgramID: IDLprojectFile
EXEFile: %ProgramFiles%\RSI\IDL60\bin\bin.x86\idlde.exe

ProgramID: prj.HyperNextCreator
EXEFile: %ProgramFiles%\HyperNext Studio\HyperNext Studio Full\HyperNextCreator.exe

ProgramID: UltraEdit.prj
EXEFile: %ProgramFiles%\IDM Computer Solutions\UltraEdit\Uedit32.exe

Show all 23 listings To Top

a prj projected coordinate system file is a special file format by ESRI and should only be edited and saved with the appropriate software.

How to solve problems with PRJ files

Associate the PRJ file extension with the correct application.
Update your software that should actually open projected coordinate system files. Because only the current version supports the latest PRJ file format. Search, therefore, e.g. on the ESRI manufacturer website after an available ArcGIS update.
To make sure that your PRJ file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .PRJ file online - secure, fast, and no downloads needed.