Modding with the Steam Version?

Hey all,

I've tried modding the BG:EE (steam version) and I'm having some serious difficulty. I've copied the dialog.tlk file into the main directory and made a hard link using "mklink /H dialog.tlk .\lang\en_US\dialog.tlk" but I still can't install SCS (I get an error message). Any ideas as to what I might be doing wrong?

Specifically, after I try to install the command prompt says "ERROR: sys-error("override: invalid argument")