In AutoNEST, there are three system files that affect and control the performance of NestPRO, the nesting engine and other functions. They are :
| ANEST.SYS | ANEST.SYS contains all the relevant and essential variables that affect parts approximation in Nesting. 
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| ANEST.TOL 
 | ANEST.TOL contains the 'aperture' value for SavePart / MirrorPart and part expansion control for cutting gap consideration and arc approximation for nesting speed and quality. 
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| ANEST.SET 
 | ANEST.SET contains parameters that will interface with non-AutoCAD systems, e.g. AutoSketch, Generic CAD, where a full DXF is required or the layer names are restricted to numeric. 
 ANEST.SET also contains the default values for TaskEdit, default display distances between nested layouts and Auto-Bridge. 
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