Criminal inquiry: case file lost in court

IF you are the complainant then You need to file a complaint first before the Judge that has ordered the inquiry if he does not respond in reasonable time say 90 days max, go before the Chief Judge (The Chief Judge is the man to go to for administartive irregularities in Court functions, he is duty bound to looks after work of all judges in that particular court building/ area) of that Court before you file RTI. (dont worry if you have already filed RTI). Contact a Lawyer that has guts to file such complaint before the Chief Judge of that Court.

IF the Chief Judge also does not respond in reasonable time file a writ petition claiming a writ of certiori before the High Court (usually the matter will be heard by the Chief Justice of the HIgh Court) 

With a responsible advocate (one that holds reputation before the Courts Judge and other administrative staff) at your side you can get favorable order in max 6 months.

ahmedabad it is