Change counter strike source resolution without lauching the game?

Answer 1

If you have steam version, right click game on steam and select Properties. On Genear tab click "Set launch options..."

Add following:

-h 600 -w 800

(If other parameters exist, just add these ones after existing ones)

Click OK

If you have non-steam version, you should have shortcut to launch game (if you don't make one). Right click shortcut and select Properties.

On shortcut tab you see "Target:" line. It's something like:

"X:\Counter-Strike Source\hl2.exe" (there might be some parameters like -game cstrike)

Just add "-h 600 -w 800" to end, so it should look like:

"X:\Counter-Strike Source\hl2.exe" -h 600 -w 800

(If other parameters exist, just add these ones after existing ones)