OK now it does work. The R package can convert the original code.txt into an Excel file.
output=the name and path of the Excel file
file=the path and the original name of the file
Since you mentioned that the base64 string can come via some stream I have loaded the content of the TXT file into knime and saved it again and converted it again to see if there is a way to do it without having an original TXT file.
There should be a way to directly convert a block via R, but it is possible that there is a bug or something. It does not yet.
kn_example_base64_02.knwf (123.7 KB)
this is the basic R code
library(base64enc)
base64decode(output = c(knime.flow.in[[“base64_result_file1”]]), file=c(knime.flow.in[[“base64_file”]]))