Text File Data Augmentation

ASCII text file format. Windows 7. Single seat operation on single desktop computer. Use browser to locate subject file. *.txt extension type is default. On screen provide a user button to initiate automated file examination process. Individually examine each line within subject file. If numeric data is populated within cells 151 -159 only insert a single digit capital “C” into location #160. If there is no data in position 151-159, do nothing and move to next record. Individually examine all records in file. Total record length should be 161 characters. Include a carriage return and line feed if necessary. All other data within file to remain unmodified and in same column format. At end of file, terminate process and automatically save the updated file as new name with a .txt extension. Allow user to select another file to process for same operation. Provide user option to close program with a confirmation message each file was successfully updated.