i have saved my 2007 world file on USB and lost it. can i retrive the file from the computer that i have worked on,
i tried searching .docx, but with no luck
Unfortunately you might be out of luck. You could either try recovering it via the suggestions from this article: https://support.microsoft.com/en-us/help/316951/how-to-recover-a-lost-word-document or by trying out data recovery software, hoping that you'll be able to find it: https://www.lifewire.com/free-data-recovery-software-tools-2622893.
Unfortunately you might be out of luck. You could either try recovering it via the suggestions from this article: https://support.microsoft.com/en-us/help/316951/how-to-recover-a-lost-word-document or by trying out data recovery software, hoping that you'll be able to find it: https://www.lifewire.com/free-data-recovery-software-tools-2622893.