If an unsaved file is closed, there may be a number of ways to recover it. The success rate of a recovery depends on the software you use, your operating system, and what you do after the file is closed. Here are some possible ways:
Look for auto-saved files: Many software have an auto-save feature that may automatically save a backup when the file is closed. For example, in Microsoft Office, you can try selecting Recent under the File menu and looking for an auto-saved version of the file.
Check the temp folder: The operating system and software may store unsaved file data in a temporary folder. You can try looking for related files in your computer's temporary folder. In Windows systems, temporary folders are usually located in:C: Users Your username is AppData Local Temporc:\windows\temp
Use data recovery software: There are some data recovery software that may be able to scan your hard drive and find unsaved file data. These software usually need to be used as soon as possible before the file is overwritten, because once the data is overwritten by the newly written, the success rate of recovery is greatly reduced.
Check the software's auto-recovery feature: Some software has an auto-recovery feature that can recover unsaved data in the event of an unexpected shutdown. For example, in WPS Office, if the automatic backup feature is enabled, you can retrieve lost files in the backup center.
Please note that the above methods do not guarantee that you will be able to recover unsaved files. To prevent data loss, it's best practice to save your work regularly and consider using cloud storage or other backup solutions to keep your data safe.
If none of the above methods can recover your files, then you may want to consider seeking a professional data recovery service.