Opening NAS Files

The NAS file type is primarily associated with EMEP/NASTRAN/Allplan/XnViewMP.

NAS	File extension: NAS
	File type:	data file

What is a NAS file

NAS files mostly belong to EMEP/NASTRAN/Allplan/XnViewMP. Your NAS file is a multi-purpose file that stores domain‐specific data.
It may be a

environmental data file containing atmospheric measurements from EMEP. These files are used to record air quality and related data. For further details, visit EMEP.

It may also be a

finite element mesh file used in engineering analysis with NASTRAN. This format is common in structural simulations and similar analysis applications.

Another possibility is that it is a

Nemetschek Allplan project file for building design. Users in architecture or civil engineering work with such files. More info is available at Nemetschek.

On occasion, a NAS file might even hold

PNG image data in a compressed format, which standard image viewers like XnViewMP can open.

FilExt.com note: Use the appropriate software based on the file’s origin to open and view it correctly.

How to open a NAS file

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

Online NAS Text Viewer

Choose your .nas file to analyze

or drag and drop it here

Online File Viewer

✈

Read our privacy guarantee in Filext’s terms and privacy policy

Please allow ads on our site

This helps us keep our servers running. Then re-upload your file to view it.

Click here to see how to disable the ad blocker for filext.com

NAS file format:

A file format defines how the data in the file is structured. Often, the file format can be deduced from the file extension or the initial bytes (called the signature). However, different programs can use the same file extension. Furthermore, a file extension can be renamed incorrectly and double-clicking on it will then display an error when it is opened. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Our evaluation of the NAS files looks like this:

The NAS file extension is rarely used and covers different formats for different programs. The two most common formats are as follows:

• 40% of all NAS files have the same signature 1001. These files contain text and words, not binary data. The files are on average 12 KB in size and range from 3 KB to 360 KB. The file type is very recent. Several words can almost always be found in the files, e.g. EMEP, AM01L, Environmental Impact Monitoring Center, , , Yerevan, , , and days from file reference point. AM0001R.20180601.20180601.glass_sinter.nitrogen_dioxide.air.1y.1d.AM.nas is a typical file name. Files like these have the following tags: dioxide, nitrogen, sinter, glass, aerosol, sampler, concentration, particle and number.
• 15% of all NAS files belong to Nastran input data. The content consists of readable text data, which can be read using a text editor. The files are often between 1 KB and 15 MB in size. The files contain the following words: GRID, BEGIN BULK, Generated, NASTRAN and file.

All other NAS files (45%) have no uniform format. Tagged as filter, mineral, dust, pack, teom, high or mass. If you want to find out what your NAS file contains, drag and drop it onto this page.