I did what you've suggested Mouser but now the .ico file ("highend_start.ico") for the alias group ("highend_start.alias") is used for all entries inside the group^^
Do I really have to append the /icon= for every icon in an alias group now to be able to use a different icon for the group (e.g. with your "make a new .alias file and provide an .ico file for it)?
E.g. I still have a different group in myaliases.alias file name ".editor"
It contains these three entries:
EditPlus | D:\Tools\EditPlus\editplus.exe
Notepad | C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Notepad.lnk
Word 2010 | C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Microsoft Office 2010\Microsoft Word 2010.lnk
If I unfold the group by entering it all three items have their own original .exe's icon AND the icon for the complete group is NOT a DOS Command prompt but it shows the icon from the first entry inside the group (in this case: the icon of EditPlus):