If you attempt to run a legacy 32-bit VBA macro that uses Windows API calls (e.g., accessing the file system or registry) on the 64-bit module without modifications, AutoCAD will crash immediately due to pointer size mismatches.

For new projects, learn .NET (C#) or LISP. For keeping old drawings alive, this fix works perfectly.

autocad 2013 vba module 64-bit
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