Edit Weather file

Hi
I'm trying to change the irradiation data on my weather file, but every time I try to edit the .csv file it gets corrupted
I also tried excel exchange-ing the data, but it simply doesnt work.
Can someone indicate me a software that can edit the weather file without getting it corrupted? (
I think it would be nice to have the option to edit the files in SAM itself

Dear Pedro,

You should be able to edit a SAM CSV file with any text or spreadsheet software. How is the file being corrupted?

Line endings can cause problems with weather files as described in this post:

sam.nrel.gov/node/69915

Best regards,
Paul.