When you want to add a SAP GUI for HTML application to Fiori Launchpad, please refer to the withe paper below which contains all detail steps.
SAP Netweaver 7.5
Transaction Code, GUI, app, Fiori, Launchpad, HTTP, RFC Destination, webgui, t-code , KBA , CA-UI2-INT-BE , Please use CA-FLP-ABA , How To
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