If the error specifically says "Unable to open drawing," it might be a permission issue rather than a memory one.
Keygens often require higher-level permissions to modify system files. Additionally, a keygen designed for an older operating system like Windows 7 might not play nicely with Windows 10 or 11. Xforce Keygen Autocad 2013 Error Access Violationl
The keygen requires administrative access to patch the .dll files. If the error specifically says "Unable to open