You cannot do that. Either you can open your game through Steam, or you can open your game through its executable file, and the executable file will open Steam. Part of the Steam DRM is encrypting your game files. Steam has to be running to decrypt them.
How Can I Play Computer Games Without Steam?
For playing computer games without steam, you are going to require some kind of Steam Emulator or make use of another service such as GOG. A great steam emulator is SmartSteamEmu, which does the work pretty well. You can get your games from Steam Underground Forums and try them out there.
Why Does Steam Launch When I Open A Game?
Coming direct to the point, either you haven’t applied the crack correctly, or it got deleted or quarantined by the antivirus program, or you weren’t supplied with the crack that’s supposed actually to bypass the Steam Store page.
Can I Close Steam While Playing Any Game?
Yes. If you navigate to task manager (you can do so by pressing ctrl + alt + Del keys) > navigate to processes > locate steam > set the priority to low.