Windows xp updates+compatabillity updates

All right, i'm gonna need some BIG help here. What I plan on doing is releasing some updates that extend compatibility of some applications. If anybody knows how to make this possible please let me know. I plan on extending google chrome support when that ends. If anybody has any applications they want extended please let me know here.
Wouldn't that be similar to KernelEx used to extend Windows 2000 and 98? Have you talked to the folks behind those efforts? It probably would be wise to visit the MSFN forums for this.