Hello,
The problem is at the OPEN statement, and it happens because the first line is too long. Fortran has a "feature" that dates back from the punch cards, that is its fixed width. That is, in Fortran 77 anything you type beyond the 72nd character is ignored by the compiler (132nd character in modern Fortran). Telemac compiled with fixed-form fortran, so you will have to shorten your OPEN line to 72 characters max.
You have two options:
First and most straightforward is to shorten the path to your file, as Andreas suggested. If you cannot shorten the path, do it with the file name. For example, call your file "wav" (without extension). It should solve the problem.
Second is to split the path into two lines and concatenate them. Like this:
OPEN(UNIT=26,FILE='C:\opentelemac-mascaret\Test_14\telemac\'//
& 'Offshore_boundary_waves.txt',
I split the name in two strings, and concatenated them using the // operator. I also moved the second part to a new line and use the line continuation character (&) to show the compiler that the second line is a continuation of the first.
Either of these should work.
Regards,
Phelype