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Details of the .proj file extension

The table below provides useful information about the .proj file extension. It answers questions such as:

  • What is the .proj file?
  • What program do I need to open a .proj file?
  • How can the .proj file be opened, edited or printed?
  • Where can I find the specifications for .proj?
  • Which MIME-type is associated with the .proj extension?
  • How can I convert .proj files to another format?
  • What are other, similar filename extensions to .proj?

We hope you find this page helpful and a valuable resource!

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

.proj file extension details

Poseidon for UML Project Information

Poseidon for UML Project Information .proj file icon
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
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
PROJ aliases:
PROJ related links:
PROJ related extensions:
Poseidon for UML Project

Other types of files may also use the .proj file extension.

.proj file extension error

The .proj file extension is often given incorrectly!

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

prj, pro

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

General Project File
Steinberg WaveLab Workspace
SOCET SET Project File
PATCHMASTER Protocol Editor Information
KiCad Project File
Binary Terrain Data
Chord Pro Chord
open .proj file

Can't open a .proj file?

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

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .proj file association, check the FAQ.

.proj file extension

Can I change the extension of 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 the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .proj file extension, write to us!

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