Hi Thanks for help. The SAS Temporary Files >_TD***  directory is there but the files I originally created are not there. When I create a new file as you mentioned I can see it.  I guess my computer is set in such a way so that after certain time period the files in Temporary directory is being deleted. Is there a place I can set this parameter to be longer? ... View more

Hi Kawakami,   Thanks for help. The situation is like this: I started a SAS session and created some data file in my work directory, and then I kept my SAS session idle for a relatively long time (say overnight). The next time when I looked at my work directory, all the file names are still there with file size as if the datafile is still there. But when I click on the file name it says "the file does not exist" and when I go to the SAS temporary Files directory, I cannot see any file there. ... View more

it's a personal PC. I am wondering if there is a virus on my PC. How can I tell if there is any software running that will "clean" the directory. In any case I never set one ... View more

No I don't have that. This also never happened before. Thanks ... View more

Thanks for helping but I am not using remote SAS server ... View more

Thanks so much for help. It's a regular sas license, not UE or SAS Studio. The strange thing is that it also starts happening recently. When you say preferences you mean I should go to SAS tool bar    Tools  ->  Options  -> Preferences  but I cannot see timeout choice there. Thanks again. ... View more