The Order_DHDocumentBrowseFolder property sets the default folder location when uploading documents on the Documents tab for DH_Orders. Then, when Upload is selected for a document, the file location entered in this property is opened by default.
Config Option > User > User_UserSetting
Valid folder path.
Where the setting is reflected...
DH_Orders section's Documents tab when uploading documents, and on the HD Order section's Candidate tab when adding a document.