Функция WinAPI GetModuleFileName даст тебе в строке полный путь и имя файла согласно Instance модуля. Тебе останется только выкинуть из строки имя файла.
The GetModuleFileName function retrieves the full path and filename for the executable file containing the specified module.
Windows 95: The GetModuleFilename function will return long filenames when an application's version number is greater than or equal to 4.00 and the long filename is available. Otherwise, it returns only 8.3 format filenames.
DWORD GetModuleFileName(
HMODULE hModule, // handle to module to find filename for
LPTSTR lpFilename, // pointer to buffer for module path
DWORD nSize // size of buffer, in characters
);
Parameters
hModule
Identifies the module whose executable filename is being requested. If this parameter is NULL, GetModuleFileName returns the path for the file used to create the calling process.
lpFilename
Points to a buffer that is filled in with the path and filename of the given module.
nSize
Specifies the length, in characters, of the lpFilename buffer. If the length of the path and filename exceeds this limit, the string is truncated.
Return Values
If the function succeeds, the return value is the length, in characters, of the string copied to the buffer.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If a module is loaded in two processes, its module filename in one process may differ in case from its module filename in the other process.
