VBA macro not running with excel file open

[gerald.lebret]

Hi everyone

I am having problem with a vba code.
I design a form, coded everything and it seems to work fine. When opening the file, the form is launching and excel is hidden.
my code is:

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It all works fine if I load the file without any other excel file open.
Can anyone help me?

Thanks

[protonLeah]

You did not post enough info, but you need something like:
Private Sub workbook_Open()
Application.Windows(Thisworkbook.Name).Visible = False
FrmRapport.Show
End Sub