Hi:
It says here the the default value for the LIBNAME Engine is 97:
http://support.sas.com/documentation/cdl/en/acpcref/61891/HTML/default/a003077073.htm
in the discussion of the VERSION= option.
But that is the 9.2 documentation. I don't know whether it was different in SAS 9.1.3. You might wish to check with Tech Support on that question.
You could also just try an explicit VERSION= option.
[pre]
libname myxl excel "c:\temp\mywb.xls" version=97;
[/pre]
I never use the PATH= option on Windows, which is why I didn't show it above. I most often see it used when creating Excel files on UNIX and using PATH=, PORT= and USER= to connect to a Windows server. As described here:
http://support.sas.com/documentation/cdl/en/acpcref/61891/HTML/default/a002644677.htm
cynthia