How to retrieve dynare output (irf values for endogenous variables)

I ran a DSGE model and want to retrieve the impulse response of variables in my model but I can see the relevant file in the dynare directory. I am using Dynare 4. 5. 1 on Matlab R2008a and the outcome of the stock_simul is not friendly usable. I could not get the oo_.irfs file which suppose to provide the impulse response values of endogenous variables of the model.
The main point is that I need these values in order to compute the fiscal multiplier following different fiscal shocks (government consumption shock, different tax rate shocks, interest rate shocks and so on).

Please do not cross-post. See my reply at Where is the irf stored?