Function at 0x40d3ac
Capabilities:
Check if file exists
Unmount volume via ioctl

Disassembly:
push ebp
mov ebp, esp
sub esp, 0x1c
push ebx
push esi
push edi
mov edi, dword [ebp + 0xc]
test edi, edi
jne 0x40d405
push 0xc0000000
push dword [ebp + 8]
call dword [0x48ae88]
mov ebx, eax
cmp ebx, 0xffffffff
jne 0x40d51d
push 0x80000000
push dword [ebp + 8]
call dword [0x48ae88]
mov ebx, eax
cmp ebx, 0xffffffff
jne 0x40d51d
call dword [sym.imp.KERNEL32.dll_GetLastError]
cmp eax, 2
jne 0x40d50b
xor eax, eax
inc eax
jmp 0x40d589
push edi
call fcn.0046176a
cmp eax, 2
pop ecx
jne 0x40d41d
xor eax, eax
cmp word [edi + 2], 0x3a
sete al
jmp 0x40d442
push edi
call fcn.0046176a
cmp eax, 3
pop ecx
jne 0x40d440
lea eax, [edi + 2]
push 0x4774a0
push eax
call fcn.0046247f
neg eax
pop ecx
sbb eax, eax
pop ecx
inc eax
jmp 0x40d442
xor eax, eax
test eax, eax
je 0x40d4a5
mov eax, dword [ebp + 0xc]
mov ax, word [eax]
mov esi, str.._:
lea edi, [ebp - 0x1c]
movsd dword es:[edi], dword [esi]
movsd dword es:[edi], dword [esi]
movsd dword es:[edi], dword [esi]
push 0
movsw word es:[edi], word [esi]
mov esi, dword [sym.imp.KERNEL32.dll_CreateFileW]
mov edi, 0x20000000
push edi
push 3
push 0
push 3
mov word [ebp - 0x14], ax
push 0xc0000000
lea eax, [ebp - 0x1c]
push eax
call esi
mov ebx, eax
cmp ebx, 0xffffffff
jne 0x40d51a
push 0
push edi
push 3
push 0
push 3
push 0x80000000
lea eax, [ebp - 0x1c]
push eax
call esi
mov edi, dword [ebp + 0xc]
mov ebx, eax
jmp 0x40d3e5
push 0xc0000000
push edi
call dword [0x48ae8c]
mov ebx, eax
cmp ebx, 0xffffffff
jne 0x40d51d
push 0x80000000
push edi
call dword [0x48ae8c]
mov ebx, eax
cmp ebx, 0xffffffff
jne 0x40d51d
call dword [sym.imp.KERNEL32.dll_GetLastError]
dec eax
je 0x40d506
sub eax, 0x56
je 0x40d506
sub eax, 0x3a
je 0x40d4f3
sub eax, 0x7a
je 0x40d4f3
sub eax, 0x101b
je 0x40d4f3
push edi
call fcn.0040c346
pop ecx
jmp 0x40d506
push edi
push str.Not_a_mount_point:__1_ws__n
push 0x489840
call fcn.0040c2ea
add esp, 0xc
push 9
pop eax
jmp 0x40d589
push str.Error_opening_device:
call fcn.0040c346
pop ecx
push 2
jmp 0x40d508
mov edi, dword [ebp + 0xc]
push ebx
call fcn.0040c397
test eax, eax
pop ecx
jne 0x40d52c
push 5
jmp 0x40d57f
test byte [ebp + 0x10], 3
mov esi, dword [sym.imp.KERNEL32.dll_DeviceIoControl]
je 0x40d58e
push ebx
call dword [sym.imp.KERNEL32.dll_FlushFileBuffers]
xor eax, eax
push eax
lea ecx, [ebp - 4]
push ecx
push eax
push eax
push eax
push eax
push 0x90018
push ebx
call esi
test eax, eax
je 0x40d56d
xor eax, eax
push eax
lea ecx, [ebp - 4]
push ecx
push eax
push eax
push eax
push eax
push 0x90020
push ebx
call esi
test eax, eax
jne 0x40d58e
test edi, edi
jne 0x40d576
mov edi, str.Error
push edi
call fcn.0040c346
pop ecx
push 2
pop esi
push ebx
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov eax, esi
pop edi
pop esi
pop ebx
leave
ret
mov eax, dword [ebp + 0x10]
mov dword [ebp - 0xc], eax
mov eax, dword [ebp + 0x14]
push 0
mov dword [ebp - 8], eax
lea eax, [ebp - 4]
push eax
push 8
lea eax, [ebp - 0xc]
push eax
push 8
push eax
push 0x83722014
push ebx
call esi
test eax, eax
jne 0x40d5bc
push edi
call fcn.0040c346
pop ecx
xor esi, esi
cmp dword [ebp - 0xc], esi
je 0x40d580
push ebx
call dword [sym.imp.KERNEL32.dll_CloseHandle]
push edi
push str._1_ws_:_Not_all_new_options_were_successfully_changed.
push 0x489840
call fcn.0040c2ea
add esp, 0xc
push 3
jmp 0x40d508