Crxf_pdf.dll

Question

crxf_pdf.dll
I'm use "CR XI R2" version 11.5.10.1263
I hope export PDF file, but PDF version is problem:
Use CR XI R2 Version 11.5.10.1263, "crxf_pdf.dll" version is 11.5.10.1263
export to PDF version is "1.3" (Acrobat 4.X)
I use CR 2008 Version (12.0.0.683), "crxf_pdf.dll" version is "12.0.0.683"
export to PDF version is "1.5" (Acrobat 6.x)
my problem is simple modify/upgrade that "crxf_pdf.dll"
copy "crxf_pdf" from version "12.0.0.683" to "11.5.10.1263" replace it.
I was try, but when run CR XI R2 Version 11.5.10.1263, export PDF can't selected "export to PDF"?
any fix please!

Answer 1

Thanks help. I can't know this topic is "SDK" or not.
My problem in general say:
When Install "CR 2008 SP2" , export that PDF file , version is "1.7 (Acrobat 8.x)
but need view that "PDF" file computer, was install "Acrobat Reader Version 5.00 and/or 6.00"
when open it, said "Version is not compatible". If simple, I can upgrade that "Acrobat Reader to 9.x" is great method.
But, I found CR XI, that export PDF version is "1.3 (Acrobat 4.x)
(Q1) In this case, I can replace that "crxf_pdf.dll" to version 2008 ?
      mean keyword "Downgrade that PDF export version DLL"
I also found this event
CR Viewer 2008 (r680) , export PDF version is "1.7 (Acrobat 8.X)
CR Viewer XI (12.0.1.r228_v20071114)  , export PDF version is "1.4 (Acrobat 5.X)
CR XI R2 sp4 (11.5.10.1263), export PDF version is "1.3 (Acrobat 4.X)
CR 2008 sp0 (12.0.0.683), export PDF version is "1.5 (Acrobat 6.X)
CR 2008 sp1 (12.1.0.892), export PDF version is "1.7 (Acrobat 8.X)
(Q2) Why difference ? Is need downgrade or upgrade that PDF version, how to do it?
Please!