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
A file that has .xls, .xlsx, .xlsm as file extension then it is known as excel file.
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
video files (mpg file extension, MPEG file format). It is the same video file format. You can use booth file extensions.
An applet is a Java application, this saves files in a .class extension
Windows
.class is the extension of a java byte code file.
a file viewer is when u open ur files