Wrong format in excel download

[NancyNalvarteG]

Hello Experts ,
I have a bug in the excel download format so that I can respect the 0 in front of the number,
have tried 3 ways :
1.- GUI_DOWNLOAD, but still the error shows me in format 3.374E+17 .

2.-IF_IXML_STREAM_FACTORY , using this way I get correct with the xls extension, but when I save as the downloaded excel shows me .xml.

3.-OLE , with this way of working, I get everything perfect extension and format but it only works for GUI and I am downloading from FIORI .

My question is if there is a way to take the OLE to FIORI or if there is a way to respect the format and extension.
Document 

[lucas_machado84]

Hello,

OLE technology is not available within browsers, consequently not available within webgui/Fiori

• OLE Automation Controller

The controlling of an OLE automation server is not possible.

• Office Integration

Because Office Integration is based on OLE Automation (a legacy Microsoft Windows technology not available within browsers) it is limited within SAP GUI for HTML. Office Documents can only be viewed but not be changed. 

The only workaround available:

3314872 - SAP Desktop Office Integration Support for SAP GUI for HTML and SAP GUI for Java

-> https://community.sap.com/t5/technology-blogs-by-sap/how-to-enable-the-sap-desktop-office-integratio...