A daily updated filename extension database!

1ST file extension

The table below provides useful information about the .1st file extension. It answers questions such as:

  • What is the .1st file?
  • What program do I need to open a .1st file?
  • How can the .1st file be opened, edited or printed?
  • How can I convert .1st files to another format?

Table of Contents

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

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

✅ Readme Document

Readme Document .readme file icon
README file is a Readme Document. A README is a text file that introduces and explains a project.
README format description not yet available
Category: Document files
Application: Notepad
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
README aliases:
1st, me
README related links:
README related extensions:
Plain Text Document

End-user License Agreement Text

Unicode Text File

Unix Readme Document

Windows 32-bit Readme Document

Linux related Readme Text

HP Unix related Readme Text

OpenBSD related Readme Text

Chinese Text Document

Other types of files may also use the .1st file extension.

🚫 The .1st file extension is often given incorrectly!

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

1t, lst, qst, st, wst

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

SignIQ Field List
NextSTART Theme
Ingres Dump List Data
LittleSmalltalk Source Code
µVision Assembler Listing Data
Intuit Quicken v4 Data File
Fortran 1T Data
Alan MAP 500 Map List
Zelda Classic Quest
IMail Server List Server Mail

🔴 Can't open a .1st 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 .1st file association, check the FAQ.

🔴 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 .1st file extension, write to us!

Browser: Abbreviation Application Archive Audio Configuration Data Development Disk Image Document Ebook Font Game Data GIS Graphic Malware Multimedia Other Project Scam Unknown Video
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