1) If he is a former partner of yours in that business, he may have a right to the files if they were (a) created by your for the business (as work product, as samples, etc.) and/or (b) created by you during business hours using business equipment; in these cases, the files would be business assets which he, as a partner, would be as entitled to as you are.2) Even if the files are not business assets to which he may be entitled by dint of having been a partner in the business which created them, if they have an monetary value, they would be assets which the bankruptcy court could take cognizance of and require the liquidation of (i.e. the sale of--including to this partner, if he's the only one would buy them) to satisfy creditors.In short, there are ways he can reach them. You should retain a lawyer to advise and represent you to protect your assets, including these files.