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The gbm subsystem which implements GIF used the POSIX I/O functions (open(), read(), write(), etc.), so this involved porting it to use the C stdio routines (fopen(), fread(), fwrite(), etc.) and using wxFopen, which supports wide characters. It also involved changing an int file descriptor to FILE* and using wchar_t instead of char wherever filename are used. As a result, the files underwent sweeping changes, even if only a few are significant.