It provides facilities for
everything that is needed to create a fully-functioning APE module.
Application Enhancer SDK is used in such well-known products as WindowShade X, FruitMenu, Labels X, and many others.
What's new in Application Enhancer SDK
You may have to restart after installing.
SDK Specific: Adjusts how kAPEMatchFlavorKey is interpreted. If an application is 64-bit (Adobe CS5), kAPEMatchFlavorCocoa will be used. If an application has LSRequiresCarbon or LSPrefersCarbon set (iTunes 10), it will be treated as if kAPEMatchFlavorCarbon is set.
APE Modules should never rely on the value of kAPEMatchFlavorKey as it often lies. Use dynamic runtime inspection instead.
This should address WSX 5.0.x not working in some applications until WSX can be properly updated.