How to edit a .sys file

[emazur]

I'm convinced the driver for my tv tuner's crossbar is "not right" and I'd like to poke around a file called cx88xbar.sys to see if I can find anything suspicious. In the past I've used notepad to edit old dos system files (autoexac.bat and config.sys), but this .sys file is only partially readable by notepad, showing alot of garbage characters. Any advice on how I can view/edit it correctly?

I've never manipulated drivers before, so I'm also just curious if any user here has solved annoying problems by self editing such .sys files (especially if capture card related!).

[mpucoder]

With the exception of config.sys, .sys files are executable. You need a compiler or assembler and the source code to recreate them, or a hex editor to make small patches.
These files are also not used by modern versions of Windows, they are called "legacy drivers" because they run in 16-bit real mode.