IGES
Import Options 

File
Import
Set IGES Options
Use this form to perform various tasks while importing an IGES file.
Complete the form as desired and pick OK to accept the current selections as the new defaults or Reset to return all selections to their previous defaults.
Auto sew geometry
Closed surface volumes will be sewed (joined) at their mating
edges to form a solid once they have been imported into VX. This option
requires that the imported edges fall within tolerance of each other.
If importing directly into an existing object or one that is currently active, the default tolerance displayed in the Part Settings Form is used. If importing into a new object (created during the import), the default system tolerance (0.1mm) is used.
Auto activate part
The imported file will be automatically activated for editing (i.e., it will become the active part).
Rename layer collisions
If the IGES file is being merged into the active part or drawing sheet and it contains references to layer names that already exist, the IGES file layer name references are renamed. If this option is not checked, then the contents of the layers are merged with the existing layers.
Remove duplicate surfaces
If there are duplicate trimmed surfaces, the duplicate is thrown away if this option is selected; otherwise, the duplicates goes to a layer named 'DUPLICAT'.
Break trim edges
Trim loops will be evaluated for tangent discontinuities and broken if required.
Reset Dependencies
It is not uncommon for third party IGES files to contain incorrect dependency flags causing entities to not import, or to import more than once. Use this option to flushes the dependencies reported in the file, and recreate them based on the entity references from the parameter section of the IGES file.
Drawings - Embedded drawings will be in 3D space.
Bounded planes - Bounded planes will be imported.
Unbounded planes - Unbounded planes will be imported.
This sets the default directory for locating
files to import of the specified type. Pick the folder icon to select
a path from the Directory Browser. The path will
be added to the Default Directory Field. The Default directory
field only applies to the active session while
VX is running unless it is permanently saved using the Save Settings
button on the Import Form.
More about the Default Directory 
All import/export translators have their own default-directory on their options form. If the default-directory is set, then the Directory Browser will always come up in that directory. If the default-directory is not set, then the file browser will come up in the "last visited" directory.
The last visited directory is not unique. There is one last visited for all import translators and one for all export translators. By default, the value in the Default Directory field is set to '.' which means, use the "last visited" directory. The file icon allows you to browse for a directory which will then be the new default. You can set the Default Directory back to "." by selecting Reset on the form.
OK - Pick OK to accept the current selections and make them the defaults.
Reset - Pick Reset to return all selections to the previous defaults.