It looks like you’re trying to find a way to run OptiFine (often misspelled as "Opticraft") for Minecraft on Windows 7 for free.
mod or specific legacy versions of Minecraft. There is no official "Opticraft" software; it is likely a misspelling of OptiFine, the popular optimization mod. Accessing Minecraft on Windows 7 opticraft minecraft windows 7 free
There is no single official game called "Opticraft," but the name is used by three primary community-driven projects: It looks like you’re trying to find a
"Invalid win32 application" error: This usually means you have a 32-bit version of Java installed but are trying to run a 64-bit game, or the file is corrupted. Re-download the file and ensure your Java version matches your Windows 7 architecture. Search for "Java 8 Offline Installer" and download
Opticraft Minecraft Windows 7 Free: A Comprehensive Guide