Run C program compiled as DLL in AKS POD

Hi Team,
Currently we have a customer running application in C program compiled as dll's and hosted the apps into Windows 2016 server in their on-prem data center.
Now we have to migrate the apps into Azure cloud. Customer prefer to deploy this apps into container solution without code change (or) minor code change.
Is it possible to run C program dlls into AKS with small code change ? If NOT then what is the best possible treatment we should offer to customers for this application seamlessly deployed into Azure cloud ?
The application contains logic for calculation engine and it doesn't have any UI and backend DB. It is invoked by another web application to get calcs response.
Thanks.