Home > .1* extensions > .1st extension
How to open a file with .1st extension?
File type: Information
Compatible with Windows 10, 8.1, 8, 7, Vista and XP
Searching for the right program to open .1st files?

"You'll need a new app to open this file" is probably the most common error faced by millions of Windows users every day. This is either because the program required to open a file is not available on your system or there may be other issues.
What is .1st file extension?

Readme text file sometimes bundled with applications; contains important information or instructions for operating the software; uses the "1st" extension so that users know to open the readme first before running the application for the first time.1ST files are not as commonly used as the filenames README or readme.txt.

Windows Desktop Software that can be used to open .1st files:
Microsoft Notepad, Other Text Editor.