renderPDFForm attached a file with "_127770202"

[Former Community Member]

I used the renderPDFForm2(LC ES2) method to prepopulate a form and attached a word file too,

this method appends something like this "_1257974499781" in the name of the file attached : "test.doc_1257974499781"

in renderPDFForm(LC ES2 and LC 8) method is added too.

I need preserve the extension of word file ".doc",  this is a bug? o I do something wrong?

Thanks in advance!