Hi from Paris,
During inter-war period in Poland, business and companies had to be registered to Polish administration.
I don't know for Rivne, but in Lodz, these files have been preserved and can be copied at local (city) archives (in Poland, normally Polish USC archives).
So I could get copies of my GG-Uncle's business file who managed an "Irish Pub" in Lodz' main street.
One astonishing point : to definitely close this business file (which hadn't been closed after Holocaust, even if my whole Lodz family had been exterminated), Polish administration sent two official letters at business address in 1972'.
As nobody replied (they knew and we know why...), this administration could close the company's file.
Archives & History of Medem Center - Arbeter Ring (Bund / Workmen Circle of France)