The latest update to my xAnim Exporter(1.51) includes a updated converter that supports more than just Cod5 to Black ops 1 converting.
You can now drag and drop a Cod2 xAnim and have it directly converted to either a Cod4 / Cod5 or Black Ops 1 animation.
Converting the other direction is also supported, meaning Cod4 / cod5 And Black Ops 1 animations can be directly converted to the Cod2 xAnim format.
If you already have the program just start it and it will update.
Otherwise the latest version of the program can be found in the downloads section.