Hi,
First of all, thank you for your research.
After having reviewed almost all the links, I tried not to more use the double quot marks (") which surrounded the location of the file.
In conclusion:
for a "dot" file : "/tContemporary Fax.dot" working
for a "xlt" file : /t name of the file.xlt !!! don't use the double quot mark and put a space between the start command and the filename.
Matthieu