TSXZS0032 {0} will be opened in read-only mode because non-displayable characters were detected.

The file to be opened in the editor contains characters that cannot be converted properly using the indicated code page. Write protection is automatically enabled since saving the file back to the mainframe would corrupt its contents.

User Response:
Verify that your code page settings (including file mappings) are correct, change them if necessary and re-open the file in the editor.