it creates a stackdump file. here's what it says:
Exception: STATUS_ACCESS_VIOLATION at eip=77C3F078
eax=0023E964 ebx=0023E720 ecx=0023E98C edx=77F5166A esi=0023E95C edi=0023E98C
ebp=0023E970 esp=0023E700 program=C:\DOCUME~1\COOLIS~1\Desktop\EMULAT~1\N64\mupen\mupen64.exe
cs=001B ds=0023 es=0023 fs=0038 gs=0000 ss=0023
Stack trace:
Frame Function Args
0023E970 77C3F078 (0023E98C, 0040106D, 0023E9C0, 0040107C)
0023E9AC 77C3C8C1 (77F5166A, 0040106B, 00000064, 0000006C)
0023EF7C 004011CB (0023F3EC, 0023F3EC, 00000104, 00000024)
0023F4FC 00401FDB (00200156, 00000001, 00000000, 0023F64C)
0023F528 77D43A68 (00401E54, 00200156, 00000001, 00000000)
0023F590 77D43B37 (00000000, 00401E54, 00200156, 00000001)
0023F5E4 77D4450D (01EB6E68, 00000001, 00000000, 0023F64C)
0023F614 77D4887F (0023F624, 0000009C, 0000009C, 00000023)
0023FB44 77FB4DA6 (80000000, 00000000, 0023FBDC, 02CF0000)
0023FBF0 77D48AB5 (80000000, 00401040, 0023FBDC, 02CF0000)
0023FC2C 77D48B57 (00000000, 00401040, 0040190B, 02CF0000)
0023FC68 715B2277 (00000000, 00401040, 0040190B, 02CF0000)
0023FD18 004026E7 (00400000, 00000000, 01ADA8CC, 00000001)
0023FD90 00433B15 (00000001, 02171008, 02170E9C, 715A33AA)
0023FF30 61005B8E (610C29AC, FFFFFFFE, 00000148, 610C28D0)
0023FF90 61005E2C (00000000, 00000000, 00000001, 70A71A29)
End of stack trace (more stack frames may be present)