.1ST File Extension
Readme File
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What is a 1ST file?
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.
More Information
1ST files are not as commonly used as the filenames README or readme.txt.
Programs that open 1ST files
Windows
Included with OS
Other text editor