WIN32_FIND_DATA FindFileData;
char szCurPath[MAX_PATH + 1] = { 0 };
GetCurrentDirectory(MAX_PATH, szCurPath);
CString findFileName;
findFileName.Format("%stest*.txt", szCurPath);

HANDLE hFind = ::FindFirstFile(findFileName, &FindFileData);
if(INVALID_HANDLE_VALUE != hFind)
{
       do {                        
             findFileName.Format("%s%s", szCurPath, FindFileData.cFileName);
             DeleteFile(findFileName);
       } while(FindNextFile(hFind, &FindFileData));

       FindClose(hFind);
}