All about OP2 Files

The OP2 file type is primarily associated with MSC Nastran.

OP2	File extension: OP2
	File type:	binary file

What is an OP2 file?

OP2 files mostly belong to MSC Nastran. OP2 files are Nastran output files used in engineering analysis. They store simulation results in a binary format, which includes data such as stress, displacement, and other finite element analysis outputs.
Key Details summarized by FilExt.com:

Simulation Data: They contain numerical results from structural computations.

Binary Format: The file stores data compactly, making it unreadable in normal text editors.

Specialized Software: These files require tools like MSC Nastran or compatible post-processing software to open and analyze.

Engineering Focus: They are primarily used in the field of finite element analysis for detailed simulation output.

FilExt.com tip: For further details, check the MSC Software resource.

How to open an OP2 file

You need a suitable software like MSC Nastran to open an OP2 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 OP2 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a OP2 file directly in the browser:. Just drag the file onto this browser window and drop it.

Online OP2 Text Viewer

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Online File Viewer

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Programs that open and convert OP2 files:

MSC Nastran
See the previous paragraphs to learn more about the main application. OP2 files are often referred to as MSC Nastran data files because this type of file is primarily created or used by this software.
Musplay 1.72 File
NEi Nastran (Binary Results Neutral File) by Noran Engineering, Inc.
NEi Nastran design simulation and virtual prototyping Mechanical Engineering Software products allow companies to reduce product development costs and improve time-to-market.
Outpost 2 Saved Game
Related links: Supporting Site
Stanford Research Systems (Optimlelt File) by Stanford Research Systems, Inc.
Instruments for Test, Measurement, Research and Analysis. The identifying characters used for this association are - Hex: 53 74 61 6E 66 6F 72 64 20 52 65 73 65 61 72 63 68 20 53 79 73 74 65 6D 73 20 4F 70 74 69 6D 6C 65 6C 74 20 46 69 6C 65, ASCII: Stanford.Research.Systems.Optimlelt.File.

OP2 file format:

The file format determines how the data is stored in the file. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. However, different programs can use the same file extension, and file extensions can be assigned incorrectly. Knowledge is power - this also applies when dealing with unknown or faulty files. Our evaluation of the OP2 files is as follows:

The OP2 file extension is rarely used and mainly uses a special format. The following file formats are most commonly found in OP2 files:

85% of all OP2 files start with the bytes 04 00 00 00, which are crucial for this file format. If you open these files in a text editor, you will see only illegible characters. Most of these files are 26 KB to 70 MB in size. The file type was developed only in the last few years. The files contain the following words: NASTRAN FORT TAPE ID CODE . Files like these are about solution, modal, response, model, analysis, random, static, plate, base, beam and step.
2% of all OP2 files belong to OP2 bank format. They consist of illegible, cryptic characters. OP2 files are between 11 KB and 11 KB in size.

All the rest of the OP2 files (13%) have different formats. Files like these are sometimes linked to trial, dmap or sram. Just click the "Choose your .op2 file to analyze" button on this page to find out what your OP2 file is.

Technical Data for OP2 File Extension

File classification:

Data

Related files:

bdf, f06, op4, pch, op1, dat

an op2 binary file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with OP2 files

Associate the OP2 file extension with the correct application.
Update your software that should actually open binary files. Because only the current version supports the latest OP2 file format. Search, therefore, e.g. on the manufacturer website after an available MSC Nastran update.
To make sure that your OP2 file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .OP2 file online - secure, fast, and no downloads needed.