Easily corrupt a file. A much better version of my previous corrupter. Tested on Python3 in Windows and Debian Linux

corrupt.py

import argparse, subprocess

parser = argparse.ArgumentParser(description='Corrupts files.')

parser.add_argument('infile', type=str)
parser.add_argument('outfile', type=str)

parser.add_argument('-n', '--nth', metavar='N', type=int, help='corrupt every Nth byte', default=1000)
parser.add_argument('-i', '--increment', type=int, metavar='N', help='increment corrupted bytes by N', default=1)
parser.add_argument('-s', '--start', type=int, metavar='offset', help='start at corrupting at offset', default=0)

parser.add_argument('-e', '--execute', type=str, metavar='executable', help='execute a file after corruption')

args = parser.parse_args()

with open ( args.infile, 'rb' ) as f :
    b = bytearray ( f.read() )

victims = range(args.start, len(b), args.nth)

for v in victims :
    b[v] = ( b[v] + args.increment ) % 0x100
 
# Write out the corrupted file
with open ( args.outfile, 'wb' ) as output :
    output.write ( b )

if ( args.execute ):
    subprocess.call ( [args.execute, args.outfile] )

#Example use in Windows
#python corrupt.py -e e:\tom\games\zsnes\zsnesw.exe -i 1 -n 10000 -s 9384 dkc.smc dkc-c.smc