A rai file extension is related to the SPEFO, a program used for processing stellar spectra.

Detailed description

Software that open rai file

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RAI file extension - SPEFO data

What is rai file? How to open rai files?

File type specification:

Various data file type icon Various data file type

The rai file extension is associated with the SPEFO, a program for one-dimensional spectra processing developed by Astronomical Institute of the Academy of Sciences of the Czech Republic.

The rai file stores various data used for internal purposes of the SPEFO.

The default software associated to open rai file:

SPEFO picture or screenshot

SPEFO  Microsoft MS-DOS software

Company or developer:
Astronomical Institute of the Academy of Sciences of the Czech Republic

SPEFO is a small, yet powerful program used for processing stellar spectra at the Astronomical Institute of the Academy of Sciences of the Czech Republic in Ondrejov. It was originally written in 1990 by Dr. Jirí Horn for processing spectral plates obtained with the 2m telescope of the Ondrejov observatory and scanned with the local five channel microphotometer. Since then the code had been under constant improvement until the sudden death of the author in December 1994. Currently SPEFO is used mainly for the reduction of data from the Ondrejov Reticon detector (1872 pixels, 12 bit A/D), however it can process data from other instruments too, provided that they are in FITS one-dimensional format.

Help how to open:

The rai files are used for internal purposes of SPEFO.

How to convert:

As far as we know, this .rai file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

List of software applications associated to the .rai file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open rai file, edit rai file, convert rai file, view rai file, play rai file etc. (if exist software for corresponding action in File-Extensions.org's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting rai files.

Programs that can create rai file - SPEFO data

Programs supporting the exension rai on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about SPEFO for create rai file action.

Microsoft MS-DOS:

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