GUI_UPLOAD and UNICODE or UTF-8

Hello,

I wanted to convert some files in SAP, i.e. :

- data is processed in MS Excell and saved as Unicode file

- I read the file into SAP, process the strings and write it back

The problem is that there are some special polish characters in the file. I read the file using GUI_UPLOAD FM, but I didn't manage not to have these special characters replaced (by # by default).

Anyone came across this problem before?

Regards,

Michal