I have created installer from Visual Studio Package and Deployment, but after successful installation, the installer files (like dlls, images and all supporting files) modified date or even creation date has been changed and all have the same date depends on the date of installation. Is there a way I can preserve or maintain it's original creation/modified date? Any idea, please share. Thank you..

I don't think you can since you actually replaced/modified a file the PC itself will change the date.

If the DLL is a custom DLL, you can set the DLL's assembly information in the MyProject > Application > Assembly Information

You can type the original creation date in the Description field.