Enumerate Files in a directory (using WIN32 API)

This can be done with Windows API FindFirstFile (FindFirstFileEx) / FindNextFile / FindClose. Please see:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa364418%28v=vs.85%29.aspx[^].

[EDIT: answering a follow-up question]

Pay attention that these functions find all file system objects in a current directory: both files and directories. Pay attention that the structure _WIN32_FIND_DATA has the field dwFileAttributes, the values of the fields are FILE_ATTRIBUTE_… constants, and one of the attributes is FILE_ATTRIBUTE_DIRECTORY. You can test if this bit is set in the field dwFileAttributes for each found item, and, if this is a directory, recursively find files in it.

Please see:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa365740%28v=vs.85%29.aspx[^],
http://msdn.microsoft.com/en-us/library/windows/desktop/gg258117%28v=vs.85%29.aspx[^].

Is it clear now?

You could easily find this information by yourself.

—SA