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The default value for MICROPYPATH used in unix/main.c is "~/.micropython/lib:/usr/lib/micropython" which has 2 problems when used in the Windows port: - it has a ':' as path separator but the port uses ';' so the entire string is effectively discarded since it gets interpreted as a single path which doesn't exist - /usr/lib/micropython is not a valid path in a standard Windows environment Override the value with a suitable default.