Use TweakUI. It is a very small utility and very simple to use. And it is safe too as it is from Microsoft.
Get it from here for WinXP. And here for Win98. To install it in 98, right-click the Tweakui.inf file, and then click Install.
In TweakUI for XP goto the Templates option, where you will find the checkboxes for various application, check on the ones which you want and create which you wan to add.