Birthjay, it sounds to me like this is something you could make use of, to move your app to .NET overtime, without going through the major process of a total rewrite, or using a conversion utility.

Interop Forms Toolkit 2.0
http://msdn2.microsoft.com/en-us/vbasic/aa701259.aspx

Continue to maintain the application in VB6 for the time being, but as NEW elements of the application are added, do them in .NET and intergrate them into the VB6 project. This would help move the codebase overtime to the .NET platform.