Build 3266 may not support modern resolutions natively. You can try adding -w 1920 -h 1080 to the desktop shortcut's Target field, though it may stretch the UI.
CS-RIN is the oldest running community for CS modifications. Look for their "CS 1.6 Full Build 3266 Protocol 48" thread. The link is usually hosted on MediaFire or Google Drive. Filename typically: cs_1.6_build_3266_protocol48.7z cs 16 build 3266 link
For fans of AMX Mod X or Metamod , 3266 is often the baseline. It doesn't have the "engine breaks" that later updates occasionally introduced. Finding a CS 1.6 Build 3266 Link Build 3266 may not support modern resolutions natively
While direct links can change frequently due to hosting shifts, you can typically find reliable mirrors on: Classic CS Communities: Websites like CS-Skini or Top-MS. Internet Archive (Wayback Machine): Look for their "CS 1