focheck
You can use the 'Antenna House Formatter GUI' transformation scenario in oXygen to open, or refresh, the current FO file in the AH Formatter GUI (on Windows only).
Using the transformation scenario requires that you have an FO processor named 'Antenna House Formatter GUI' defined in your oXygen preferences, e.g., using the command line:
"C:\Program Files\Antenna House\AHFormatterV65\AHFormatter.exe" -d ${fo} -s
See http://www.oxygenxml.com/doc/versions/17.0/ug-editor/#topics/preferences-fo-processors.html for more details.