There are three primary reasons this keyword is searched, ranging from legitimate troubleshooting to piracy.
from the original media or official Adobe installer. This ensures all system files, including amtlib.dll , are authentic and correctly registered. you're seeing during startup? Adobe Illustrator Cs5.1 Amtlib.dll
If you lost your original installation files, request a download link from Adobe support (even for CS5.1, they may still provide it if you have a serial number). There are three primary reasons this keyword is
Identify the Architecture: Determine if you are running the 32-bit or 64-bit version of Illustrator CS5.1. Placing the wrong version of amtlib.dll into the application folder will cause a "0xc000007b" error. you're seeing during startup
If you are a legitimate owner, use the official Adobe Cleaner Tool or restore from a trusted backup. Avoid third-party DLL download sites at all costs.