Can't figure out how to use the compiler

[Plorf via Digitalmars-d]

On Monday, 21 April 2014 at 21:49:39 UTC, anonymous wrote:
> On Monday, 21 April 2014 at 19:40:01 UTC, Plorf wrote:
>> I downloaded the DMD Windows compiler, installed it in the 
>> default directory, added its location to the system path, 
>> restarted my computer and wrote a sample "hello, world" 
>> program, and it won't compile; instead it says "Error: cannot 
>> read file hello.d". My computer is 64-bit, if that matters at 
>> all. Can someone please explain how to get the DMD compiler to 
>> work or provide some links? This has really been frustrating 
>> me. Thanks.
>
> Does `dmd` without any arguments print the usual kerfuffle
> (version, copyright, usage)?
>
> Could it be that the file is called "hello.d.txt" and the
> extension is hidden? What does `dir hello.d` say?