NX routing documentation has references to filter files in the following location.
Home> CAD> Routing System> Configuring Routing applications> Managing Routing configuration files in Teamcenter
What is the use of filter files in NX routing and how it can be imported into NX?
Solution Filter files (*.flt) contains a set of filters to control the display of component navigator and connection navigator
Filter files can be imported into/exported from NX by the following method.
MB3 on Component Navigator->Properties->Click on 'Edit Display Filter',
Notice Import and Export Buttons in the bottom of the dialog for the respective actions
Hardware/Software Configuration Platform: INTL64
OS Version: 764