The help file format used for the Content help in DS|Design is not Windows 7 or Windows 8.1 compatible at this time but in the interim you can install the Windows Help program (WinHlp32.exe) for the different version of Windows:
For Windows 7, click here: http://www.microsoft.com/en-us/download/details.aspx?id=91
For Windows 8.1, click here: http://www.microsoft.com/en-us/download/details.aspx?id=40899
It is important to note that the Content help in DynaScape Design has information pertaining to the DynaCADD Engine on which Design was built; as such much functionality that is found in Design is not covered in the Content help and likewise, some functionality found in the Content help is not found in Design. The DynaCADD Content help was left in Design as it provides valuable information on the underlying functionally of the application which is useful for advanced users for tasks such as creating custom Command Aliases.