Retrieve data from AVHD

We tried merging a restored AVHD with VHD and it worked but the SQL was currupt.

We tried to try merge again on the Backedup VHD and the merge progress screen closes as such and then after give an error "invalid parameter " if we try merge again.  We noticed that the VHD file creation date is changing to current date.

Now we are looking to retrive sql data from AVHD, is there any utilities.