Open PRJ File
The PRJ files have, up to now, two different applications, namely:
Project File
In this first case, the PRJ file acts as a generic project file extension used by multiple programs.
The PRJ normally saves the project data and settings and can include references to other files used by the project.
Open and operate a PRJ file, in the 'Project File' format
There are various applications that can save projects with a PRJ extension, however they are not guaranteed to open all PRJ files.
Therefore, the mentioned programs should serve as a reference for possible file associations for PRJ files, for example:
ESRI ArcGIS for Desktop: a complete desktop GIS software suite that allows the user to create maps, perform spatial analysis and manage data.
Autodesk AutoCAD: a commercial well-known computer-aided design and drafting software application.
Progress Stylus Studio: an integrated development environment for the Extensible Markup Language XHTML.
Autodesk 3ds Max: a professional 3D computer graphics software for making 3D animations and models, specially for games and images.
Microsoft Visual Basic: an event-driven programming language from Microsoft, in a third-generation, and known for its Component Object Model (COM) programming model and based, mainly, in Basic Language.
MathWorks MATLAB: a mathematical computing software with multiple functionalities, related to scientific and educational purposes calculation.
AIMMS Project File
In this case, the PRJ file is an AIMMS project file, which stands for Advanced Integrated Multidimensional Modeling Software.
The PRJ contains information for the development of operations models, including project settings and user interface components, such as menus and end-user pages.
An associated AIMMS model file, in AMB format, is saved along with each project file.
Software to open a PRJ file
Due to the great diversity of types of formats for the SMI extension, it is advisable to make sure, first, of the type of file you have in your hands, and then to have one of the following software packages: