Add-ins are special files that provide additional functionality. After downloading an add-in file, the Add-ins Manager must be used to install it. Add-ins files have extension .xla or .xlam (for Excel ...

does anyone know if it is possible to write add-ins for Excel 2011 on the Mac? Preferably in C/C++/Cocoa, but almost any language would do. If so, pointers towards the SDK would also be appreciated.