Uno service: return folder content as a sequence (array) of file url?

I once found this service and cannot find it again.

Could it be that you are looking for:

Thanks! However, my question was not about the file picker. It was a service to which I could pass an accessible folder in URL notation and which returned the contained elements. The result was called a sequence but actually was a 1D-array.

I got it again. It was the service
My question specifically addressed one of many member functions (of the interface):
sequence< string > getFolderContents ([in] string FolderURL, [in] boolean bIncludeFolders)
In LibreOffice Basic the service is accessible via an object created by createUnoService("")

See: LibreOffice: XSimpleFileAccess Interface Reference