How to account for spaces in path of command string

We are building menus similar to what we had in AutoCAD LT and the path the files contains spaces in the path name. I tried using quotes around the path, but it stops at the first space. Here is an example of the path R:\\Draftsight\\Mechanical Blocks\\sd359.dwg". I have set the path in the Library Files Location and it still has problems.

I can enter the -insert command in the command window with the path having blanks and it works. I only have the problem when building menus and entering command string in the Commands window.

Also, version 12 of Draftsight worked and now we are having this issue with version 14.

Any help, would be greatly appreciated.

Thanks,

Tom