Need to execute under the context of a local account

[mortgagedeveloper]

My program needs to be able to update NTFS folder security on remote machines. I am trying to get the SDDL of a user's SID so I can add an ACE to the file's DACL. I am not able to reference the samlib.dll (figuring that it is the correct one) to access the SAM functions. Am I going about this the wrong way? Got this from the MS Knowledge base

http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q285998&

but can't figure out how to add a local user to a folder. Any help would be appreciated.