this worked in past no nowaydays.
if you navigate with a IE browser (IE11 emulation) to any file excel,word....its always opened as a standalone window out of the browser
try this code (maybe for security considerations).this is avalbale even as administrator priveleges.

Publi oform
oform=Newobject("asup")
oform.Show
Read Events
Retu
*
Define Class asup As Form
	Top = 1
	Left = 17
	Height = 442
	Width = 725
	ShowWindow = 2
	Caption = "Form1"
	Name = "Form1"

	Add Object olecontrol1 As OleControl With ;
		oleclass="shell.explorer.2",;
		Top = 2, ;
		Left = 1, ;
		Height = 394, ;
		Width = 721, ;
		Anchor = 15, ;
		Name = "Olecontrol1"


	Add Object command1 As CommandButton With ;
		Top = 413, ;
		Left = 300, ;
		Height = 27, ;
		Width = 120, ;
		Anchor = 768, ;
		Caption = "Open excel file", ;
		Name = "Command1"

	Procedure command1.Click
	Local m.x
	m.x=Getfile('xls')
*m.x="file:///"+m.x
	Thisform.olecontrol1.Navigate(m.x)
	Endproc

	Procedure Destroy
	Clea Events
	Endproc

Enddefine
*
*-- EndDefine: