File Extension 1ST

.1ST File

File extension: 1ST
File type: Information


Notes about the 1ST file extension:



To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The 1ST file type is primarily associated with 'Information'. e.g., README.1ST (usually an ASCII text file). Open with any text editor.

Detailed information for file extension 1ST:


Primary association: Information
File classification: Text
Mime type: text/plain, application/text



To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

Technical data

To view technical data on file-extension 1ST click this link to expand/hide the additional area.

System Info for File Extension .1ST

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.

ProgramID: Object.Edit.1ST
EXEFile: Y:\Object Desktop\Object Edit\oe.exe %1

ProgramID: tsm1st
EXEFile: %SystemRoot%\system32\NOTEPAD.EXE %1


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