Input data is in not compatible format: invalid character 'ÿ' looking for beginning of value

[rodentooth]

`duck_f.exe -depth=3 -size=c -top=12 -filter=d -hr < .\results_a.txt Input data is in not compatible format: invalid character 'ÿ' looking for beginning of value

Arguments: filter: d depth: 3 top: 12 hr: true size: c

Results:`

Maybe some charset conversion is needed? How could I replace all invalid characters in my result.txt with a cmd command? which charset was chosen?