I ran into this issue recently. I resolved it using the Adobe customization wizard, the setting can be found here:
You can also set it after the installation using these registry settings:
Remove Open\Save Dialog
------------------------------------------------------
Windows Registry Editor Version 5.00
[-HKEY_CLASSES_ROOT\AcroPDF.FDF.1]
[HKEY_CLASSES_ROOT\AcroPDF.PDF.1]
"EditFlags"=hex:00,00,01,00
------------------------------------------------------
Add Open\Save Dialog
------------------------------------------------------
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\AcroPDF.FDF.1]
"EditFlags"=hex:00,00,00,00
[HKEY_CLASSES_ROOT\AcroPDF.PDF.1]
"EditFlags"=hex:00,00,00,00
------------------------------------------------------