IUSER_ And IWAM_

I'm using an asp template to connect to a third party application using a com interface. (read mail and fax messages from a Tobit Software) In the process some files are copied to a local directory. In order for this template to work I had to give IUSER_[machinename] and IWAM_[machinename] read/write rights to the folder where the created files are saved. My client has a problem with this setup. He pays license fees for Tobit Software on "per user" basis and since he only has a license for one user (Admin) he doesn't want me to use IUSER and IWAM. Is there a way not to use these users??? I'm a ColdFusion programmer and I'm using ASP only because CF can't use this particular com (issues with variant data types). In CF environment I don't have such problems because I have CF service logs in as an Administrator so it has a full access to the system, however I don't know how to set it up in ASP.