A New York state court is expected to rule Friday on Russian-Canadian billionaire Alex Shnaider’s attempt to obtain a client file from Boies Schiller Flexner, which previously represented Shnaider in contract litigation and has asserted a retaining lien over the file because its former client owes the firm legal fees.

Shnaider, now represented by Michael Bowen of Kasowitz Benson Torres, filed a petition on Wednesday, asking a Manhattan state court judge to issue an immediate injunction that would require Boies Schiller to provide a copy of Shnaider’s file in a separate lawsuit that has a trial scheduled to begin in December. New York Supreme Court Justice Debra James is expected to hold a hearing on the petition Friday morning.