Renaming DMD File Extensions from C to C++

["Nordlöw" via Digitalmars-d]

On Wednesday, 4 February 2015 at 12:08:18 UTC, Daniel Kozak wrote:
> "Nordlöw" via Digitalmars-d píše v St 04. 02. 2015 v 10:25 
> +0000:
>> On Monday, 2 February 2015 at 21:51:42 UTC, Nordlöw wrote:
>> > Can we please change the file extensions in DMD from .c to 
>> > .cpp for C++ sources?
>> 
>> If someone (maybe me) "is allowed" to change this I can 
>> complete my PR at
>> 
>> https://github.com/D-Programming-Language/dmd/pull/4379
>> 
>> that enables developing DMD in Eclipse with full intellisense 
>> and debugging support.
>
> This is already possible without this change

I've tried modifying "File Types" section in Properties for DMD 
project as:

*.c - C++ Source File
*.h - C++ Header File

and

src/*.c - C++ Source File
src/*.h - C++ Header File

but neith has any affect and Intellisense still fails.

What do I have to do to make this work? Please help.