_splitpath() 확장자 분리함수

#include <stdlib.h>
#include <io.h>
#include <direct.h>

char szDrive[_MAX_DRIVE];
char szDir[_MAX_DIR];
char szFileName[_MAX_FNAME];
char szExtension[_MAX_EXT];

szFilePath [] = "C:\download\test\test1.exe"

_splitpath(szFilePath, szDrive, szDir, szFileName, szExtension);

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결과
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szDrive = "C:\"
szDir = "download\test"
szFileName = "test"
szExtension = ".exe"