I agree with ittimjones and unksol. Files can just be cut and pasted onto the data drive without issue. Most programs can be re-installed onto the data drive. If for any reason the above two options aren't convenient, then symbolic links will do. Symbolic links fool all programs into thinking that the file is at the linked location. Steam Mover will make links automatically, while using they syntax "mklink /d linkName target" will create a link without the need of any software.