help windows crash

hello
one of my student is fan of TeXmacs
i gave him some shortcuts for his my-init-texmacs and all worked fine
but recently he tried to modify my-init-texmacs by himself (opening it from the Développeur menu)
and now TeXmacs does not lauch any longer
i am not comfortable with windows
the problem is : where is my-init-texmacs ?
his search on the hard drive thought the native « ctrfF » of windows does not give any result
on my mac i know that my-init-texmacs is in ./TeXmacs/progs
so i tried on his windows in programx86/TeXmacs/progs but not
if TeXmacs does not launch after a modif of my-init-texmacs, i guess the problem is in my-init-texmacs, but if my-init-texmacs does not existe i dont understand
any tipp ?
thanks for him
Vincent