A 1st file extension is related to instruction text files distributed with some applications.

There is one other file type using
the 1ST file extension!

empty icon.1st - Visual FoxPro documenting wizard list

Detailed description

Software that open 1st file

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1ST file extension - Readme first text document

What is 1st file? How to open 1st files?

File type specification:

Text file type icon Text file type

The 1st file extension is associated with the text files that are distributed with applications.

The 1st file stores information and instructions for app.

It is viewable in any text editing tool like Windows Notepad, Notepad++ etc.

Updated: April 19, 2024

The default software associated to open 1st file:

NotePad++ text editor icon

Notepad++ Team logoNotePad++ text editor  Microsoft Windows software

Company or developer:
Notepad++ Team

A very popular free text and source code editor. It supports syntax highlighting and syntax folding for C, C++, HTML, ASP, Java, Pascal, PHP, Cobol, CSS etc. Notepad++ also supports plugins to add new features. It is localized to many languages.

Help how to open:

Use text editor to view content *.1st files.

How to convert:

Possibly can be exported to other formats.

Find converter to 1st file type:

ascii to 1st

js to 1st

spn to 1st

xsl to 1st

List of software applications associated to the .1st 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 1st file, edit 1st file, convert 1st file, view 1st file, play 1st 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 1st files.

Software that open 1st file - Readme first text document

Programs supporting the exension 1st on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open 1st file action.

Microsoft Windows:

Main software associated with 1st file by default:
NotePad++ text editor small icon NotePad++ text editor
Other suggested software:
Sublime Text small icon Sublime Text
PSPad small icon PSPad
Microsoft Windows NotePad small icon Microsoft Windows NotePad

Apple macOS / Mac OS X:

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