pdf file download corrupted

[softmouv]

In a list I am using fileupload plugin to download pdf file .
when i open the source file with acrobat no problem but
when i download this file I can't open this one because there
is some code added at the head of this file(diff.jpg).

is there an option to disable this code??? (debug pdf is on NO)

 

[softmouv]

big mistake

sorry...because I use download script...it's normal...