Use Windows API to find file

I use this to find if a file exist on a users system at the time of running setup.exe. If the file exist I can then take other action. This example only searches for the file once, if found, returns the path.

PARAMETERS lcPath, lcfile
** find file located in the path passed or subfolder
IF PARAMETERS() < 1
RETURN -1
ENDIF
IF EMPTY(lcPath)
lcPath = "C:\"
ENDIF
IF EMPTY(lcfile)
RETURN -1
ENDIF
LOCAL hFind, lcFindBuffer, lnAttr, lcFilename, lcFindFileBuffer, hFindFile

DECLARE INTEGER FindClose IN kernel32 INTEGER hFindFile
DECLARE INTEGER FindFirstFile IN kernel32 STRING lpFileName, STRING @lpFindFileData
DECLARE INTEGER FindNextFile IN kernel32 INTEGER hFindFile, STRING @lpFindFileData
#DEFINE FILE_ATTRIBUTE_DIRECTORY 16
#DEFINE MAX_PATH 260
#DEFINE INVALID_HANDLE_VALUE -1
#DEFINE MAX_DWORD 4294967296 && 0xffffffff + 1
#DEFINE FIND_DATA_SIZE 318

*| typedef struct _WIN32_FIND_DATA {
*| DWORD dwFileAttributes; 0:4
*| FILETIME ftCreationTime; 4:8
*| FILETIME ftLastAccessTime; 12:8
*| FILETIME ftLastWriteTime; 20:8
*| DWORD nFileSizeHigh; 28:4
*| DWORD nFileSizeLow; 32:4
*| DWORD dwReserved0; 36:4
*| DWORD dwReserved1; 40:4
*| TCHAR cFileName[ MAX_PATH ]; 44:260
*| TCHAR cAlternateFileName[ 14 ]; 304:14
*| } WIN32_FIND_DATA, *PWIN32_FIND_DATA; total bytes = 318

lcPath = ALLTRIM(lcPath)
IF RIGHT(lcPath,1) <> "\"
lcPath = lcPath + "\"
ENDIF

** buffer used to search for the file in each folder identified
lcFindFileBuffer = REPLI(CHR(0), FIND_DATA_SIZE)
** buffer used to start search of path passed
lcFindBuffer = REPLI(CHR(0), FIND_DATA_SIZE)

hFind = FindFirstFile (lcPath + "*.*", @lcFindBuffer)
IF hFind = INVALID_HANDLE_VALUE
RETURN -1
ENDIF

DO WHILE .T.
lnAttr = buf2dword(SUBSTR(lcFindBuffer, 1,4))
lcFilename = SUBSTR(lcFindBuffer, 45,MAX_PATH)
lcFilename = LEFT(lcFilename, AT(CHR(0),lcFilename)-1)

** test for directory
IF BITAND(lnAttr, FILE_ATTRIBUTE_DIRECTORY) = FILE_ATTRIBUTE_DIRECTORY
* for a directory
IF NOT "." $ lcFilename
** look for file in ths folder
hFindFile = FindFirstFile (lcPath + lcFilename + "\" + lcfile, @lcFindFileBuffer)
IF hFindFile != INVALID_HANDLE_VALUE && file located quit with the path to the file
FindClose(hFind)
FindClose(hFindFile)
RETURN lcPath + lcFilename + "\"
ENDIF
ENDIF
ENDIF
IF FindNextFile (hFind, @lcFindBuffer) = 0
EXIT
ENDIF
ENDDO
FindClose(hFind)
RETURN .f.

FUNCTION buf2word (lcBuffer)
RETURN ASC(SUBSTR(lcBuffer, 1,1)) +;
ASC(SUBSTR(lcBuffer, 2,1)) * 256

FUNCTION buf2dword (lcBuffer)
RETURN ASC(SUBSTR(lcBuffer, 1,1)) +;
ASC(SUBSTR(lcBuffer, 2,1)) * 256 +;
ASC(SUBSTR(lcBuffer, 3,1)) * 65536 +;
ASC(SUBSTR(lcBuffer, 4,1)) * 16777216