>I tried but without success. [...]
>

Zoran, see if changing

TEXT
--<<m.boundary>>
Content-Disposition: form-data; name = 'data'; filename=<<FileName>>
Content-Type: text/xml

<<data>>
--<<m.boundary>>-- <<CRLF>>
ENDTEXT

into

TEXT TEXTMERGE
--<<m.boundary>>
Content-Disposition: form-data; name = 'data'; filename=<<FileName>>
Content-Type: text/xml

<<data>>
--<<m.boundary>>--

ENDTEXT

works.

What version of VFP are you using?