Hi,   I have started into SAS Certification Prep Guide to prepare myself for SAS Base Certification. I always try to reference library once I start a new SAS session. (NOTE: I use SAS University Edition on my Windows system using Virtual Box and localhost). The problem occurs when I try to reference an external file using FILENAME statement. Ex: filename carss '/folders/myfolders/certprep/cardata.dat' Question: Does a file name carss should be already present in the library before running this command OR it is created on the fly? I tried "work.carss" but it is no working as well. I am really getting confused to referencing as I am using a virtual machine and not the actual environment. I guess it will be different for SAS Enterprise Guide.   Please clear my knowledge about referencing libraries and files in SAS University Edition. Thanks a lot in advance. ... View more