Hi Richard, welcome to the forum.
Please post your solution so it may help others.
One option, in case it's different from your method, would be to put the full path/filename into a cell and then use the Worksheet_BeforeDoubleClick event. You can then double-click on that cell and it will open the program and file specified. (Full path/filename like: c:\users\Paul\desktop\diagram.dwg)
1. Add the following to the worksheet code module (right-click on sheet tab and choose View Code):
2. Add the following code to a standard module (in the VB Editor, click Insert > Module):
Change the program path/filename to your actual Autocad program executable path/filename.
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