//>>> WiZaRd::SlideBar [eMule+]
// By Taz - fix
//#define IDC_PREFS_SLIDEBAR 111 //note: this *should* be unique!
// <------- fix
#define PREF_PARENT_CLASS CPropertySheet
//#define PREF_PARENT_CLASS CTreePropSheet
//<<< WiZaRd::SlideBar [eMule+]
// <-------- SlideBar
not unique and probably no in place.
My suggestion :
@EMFresourcemod.h :
...
// By taz - SlideBar
//>>> WiZaRd::SlideBar [eMule+]
#define IDC_PREFS_SLIDEBAR 6999 //note: this *should* be unique!
//<<< WiZaRd::SlideBar [eMule+]
// <------- SlideBar
//note: you have to have a NEWLINE after the last line of code, otherwise you get an EOF

not at beginning in order to avoid shift of translated IDSs.