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If it is a Windows file and had been saved previosuly into your Documents folder, it can probably be restored by the operations staff in Olsen 312. Either visit them personally or email the request to help AT cs.uml.edu.
If you stored the file on your LINUX home directory, we can probably restore it from backup. Send email to help AT cs.uml.edu with as much detail about the file as possible. The ideal would be the full path to the file and the date from which you want it restored. For example:
"Please restore file: ~omacneil/school/91.101/hw10/problem6_21. I accidentally deleted it this morning."