When importing, Big Business requires full access to files being imported. They cannot be on read-only media or in-use by other applications. You must have read-write access to the files or you will encounter the error, "Couldn't open document."
This Solutions provides possible solutions. (6115)
When Importing and you encounter the error, "Couldn't open document":
if the document is being created or edited with another application, close the document or quit the application
if the document is on a CD or other read-only media copy it to your hard drive
Get Info or Properties on the file to detemine your access, which must be read-write or full access