New to Java cant get it to compile in msDOS

Using SDK java 2 version 1.4.0. Checked my personal Computer folder types.
In folders in windows 98 do java file types open with javac.exe or java.exe? Tried both. When I try to compile a simple tutorial HelloWorldApp.java , it gives me a message that javac cant read it. The path is OK on MS DOS since it recognizes the javac command. I should be having no problems with tutorial. Did I mess up the links to the class and java file types ?. Microsoft tech support fixed a problem when I opened some demo files into the wrong programs and it was permanent.Then I tried to reset the right exe files to go with the file types but I am not sure. I have tried re downloading the software several times. Should I buy a sun software or are these downloads bad?

use javac to compile java programs.
e.g.
javac HelloWorld.java
use java to run compiled code (class files)
java HelloWorld
(Don't include the extension .class when using the java command)

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    use java to run compiled code (class files)
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