How to build a package as application ?

[guiguidu60]

On Tuesday, 2 July 2019 at 10:43:08 UTC, Andre Pany wrote:
> On Tuesday, 2 July 2019 at 08:50:36 UTC, guiguidu60 wrote:
>> I'm a newbie with D language, and my first problem ever is:
>>
>> I have a hello world program build with DUB on Linux, but the 
>> program as marked as "application/x-sharedlib" and not 
>> "application/x-executable" (in properties of the file): so, I 
>> can't able to execute the program from the file explorer (need 
>> to do ./helloworld within a terminal).
>
> Executable is automatically chosen if you have a source code 
> file with name "app.d".
> Otherwise set targetType to executable in your dub.json.
>
> Kind regards
> André

It doesn't work...
Who decide if a file is an application or a sharedlib ?