GUI_UPLOAD problem if input data is using Excel

Hi , Some one can answer this quick question.

While i am using GUI_upload i am not able to recieve the data properly.

*************************

• GUI UPLOAD From Data

*************************

CALL FUNCTION 'GUI_UPLOAD'

EXPORTING

FILENAME = lvs_filenm

FILETYPE = 'ASC'

• HAS_FIELD_SEPARATOR = 'X'

• HEADER_LENGTH = 0

• READ_BY_LINE = 'X'

• DAT_MODE = ' '

• CODEPAGE = ' '

• IGNORE_CERR = ABAP_TRUE

• REPLACEMENT = '#'

• CHECK_BOM = ' '

• VIRUS_SCAN_PROFILE =

• NO_AUTH_CHECK = ' '

• IMPORTING

• FILELENGTH =

• HEADER =

its not working properly . can i give any has field separtor like 'X'

And i copied the same data in excel to text file. GUI_upload is working fine and data is exactly coming in to the internal table.

*************************

• GUI UPLOAD From Data

*************************

CALL FUNCTION 'GUI_UPLOAD'

EXPORTING

FILENAME = lvs_filenm

FILETYPE = 'DAT'

HAS_FIELD_SEPARATOR = 'X'

• HEADER_LENGTH = 0

• READ_BY_LINE = 'X'

• DAT_MODE = ' '

• CODEPAGE = ' '

• IGNORE_CERR = ABAP_TRUE

• REPLACEMENT = '#'

• CHECK_BOM = ' '

• VIRUS_SCAN_PROFILE =

• NO_AUTH_CHECK = ' '

• IMPORTING

• FILELENGTH =

• HEADER =

Any one can help me out in this regard. Client wants to use GUI_upload functional module only...