Пока только такие мысли...
Код:
StrCpy $ClassName "Winamp.File.${extenstion}"
;
ReadRegStr $1 HKLM "SOFTWARE\Classes\.${extenstion}" ""
StrCmp "$1" "$ClassName" 0 +2
DeleteRegValue HKLM "SOFTWARE\Classes\.${extenstion}" ""
DeleteRegKey HKLM "SOFTWARE\Classes\$ClassName"
;
ReadRegStr $2 HKLM "SOFTWARE\Classes\.${extenstion}" "Winamp_Back"
DeleteRegValue HKLM "SOFTWARE\Classes\.${extenstion}" "Winamp_Back"
StrCmp "$1" "$ClassName" 0 +3
StrCmp "$2" "$ClassName" +2 0
WriteRegStr HKLM "SOFTWARE\Classes\.${extenstion}" "" "$2"
