open TELEMAC-MASCARET The mathematically superior suite of solvers

according to the capture I think you're automatically masking known extension and then the real name of the config file is systel_xxx.cfg.txt
You should then change the name and remove the .txt

Hope this helps

Yes,coulet,you're right:)

The problem has been solved by removing the masked extension.

Sorry for raising such a question which is supposed to be related to system setting of my laptop.

Thanks to you and annatrinh for your time to provide so much support here.

Really thanks.

Best wishes

Hong