Methods to hex edit binary files via Powershell

Question

Am trying to perform binary hex edit from the command line using only powershell. Have had partial success performing a hex replace with this snip. Problem springs up when

Answer 1

Probably the way most idiomatic to PowerShell would be:

$offset = 0x3C
[byte[]]$bytes = Get-Content C:\OldFile.exe -Encoding Byte -Raw

$bytes[$offset++] = 0xFF
$bytes[$offset++] = 0xFF
$bytes[$offset] = 0xFF

,$bytes |Set-Content C:\NewFile.exe -Encoding Byte