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#include <string.h>
#define TYPES ".txt.ini.bak.asc"

int IsApprovedType(char *str)
{ if (strstr(str,TYPES))
return 1;
return 0; }

Then you have to write a function to test if the file extension entered by the user is part of a list of acceptable extensions... and depending on the return value of the function either open the...