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An applet is a Java application, this saves files in a .class extension
The default file extension for notepad is .txt. However, you can designate notepad as the primary application for any extension.
A compiled Help File in Windows will have the extension .chp
There is list of programs that support DO file extension http://www.howopen.org/en/extensions/web-files/do
TXT files are plain text files. They are very basic documents with minimal formatting. They can be opened and edited with notepad, wordpad, or any other word processor application.
A file that has .xls, .xlsx, .xlsm as file extension then it is known as excel file.
Answer: PRF (Personnel Readiness File/Folder) files are used in technical application and are not likely to be accessed by your average PC user. In general, PRF files are Windows system files, although they have other technical applications as well.
The main project file has a VBPROJ extension. This is also a file with the same name as the main project file, but with an SLN extension. The SLN extension is a solution file.
There is no specific file extension for MS-DOS. Files can have any 3 character extension in MS-DOS.
no
title
.rar