The coordinate calculation has changed in printer driver version 14.35.
When the Use Legacy Coordinates option is enabled, the Printer Driver generates coordinates based on previous version of text extraction.
The extracted text coordinates with Use Legacy Coordinates option will be the same as with Printer Driver version 14.35 and earlier.
This option could be useful if one updated to the latest Black Ice Printer Driver, but insists to use the same coordinates for commonly extracted documents.