I doubt there is any way to redefine the separator for just one file
extension. You associate files in the folder options area of windows.

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Regards,
Tom Ogilvy

"morsi" wrote in message
oups.com...
I have file with special extension and i would like to associate this
file to excel as a csv file. My file has the caracter "|" as separator.
How to force excel to use this separator when opening the file by a
double-click on the file ?
Thanks