The detail settings for STL Output are stored in the registry. Information on changing the detail level can be found at Autodesk's website, under the title "Set accuracy for exporting STL files from Autodesk Inventor software" and ID TS64378.
Planet Poly Jet
Similar to Hi-Res SLA
Planet Cast
Production and concept models
Machine Planet
Machined metal parts
Planet SLA
SLA Prototyping