cmd - Is it possible to edit a binary file using Windows command line? -

is there way in windows edit binary file, command line? i.e. way written batch file?

i want able edit single byte, @ known position, in existing file.

this existing question[1] solved, that's linux solution. i'm looking similar windows.

background

there's bug in gta 1 when downloaded steam whereby save-game data file gets corrupted on exit. result, game can played fine first time subsequently crashes. turns out can fixed changing 5th byte in file (i.e. byte @ address 0x04) x00 x06[2].

i can in python easily, e.g.:

with open("player_a.dat", "rb") f:     bytes = f.read() bytes = bytes[:4] + '\x06' + bytes[5:] open("player_a.dat", "wb") g:     b in bytes: g.write(b) 

ideally though i'd rather in batch job following:

• fixes data file
• launches gta

i make works me (using python), wouldn't random other people don't have python (yes know it's easy & install, still). similarly, there freeware available claims this, don't want run random .exe on pc, , don't think else should either. reason, i'd present batch file, people can inspect, , - if they're happy - run themselves.

thanks help!

[1] cli: write byte @ address (hexedit/modify binary command line)

[2] http://forums.steampowered.com/forums/showthread.php?t=1597746

[edit] fixed python script, found didn't work as-is (file.read() returns immutable object, can't update 1 of values).

i think powershell perfect tool task. it's available xp or higher , automatically shipped since windows 7:

just create *.ps file content:

$bytes = [system.io.file]::readallbytes("player_a.dat"); $bytes[4] = 0x06;  [system.io.file]::writeallbytes("player_a.dat", $bytes); & "c:\path-to-gta1-exe-file.exe" 

note 1 has enable unsigned powershell scripts:

1. start powershell administrator

2. run command: set-executionpolicy remotesigned

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you use vbscript script longer because wasn't designed reading binary files (you have use adodb.stream objects).

here compilation of helper functions: http://www.motobit.com/tips/detpg_read-write-binary-files/