Hi All,
Atlast, I am able to solve that.
I found that the problem is with the IIS asp.net version.
I am not master of that, so I just uninstall IIS(as we have no other site deployed on IIS).
And after that, I installed workflow and Ax itself configure IIS and create site for workflow.
After that when I check on workflow application pool, the property “Enable to 32 bit” was false and
on workflow site > Handler mapping , already pointed to framework64 folder.
And it works…