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Thank you again for your help.

Thank you for your reply. I could not open the backup file with TeXworks, so I tried an online program.

I opened the ***.lyx~ file with FILExt, an online Lyx Text Viewer (https://filext.com).

After opening the ***.lyx~ file online, I clicked 'save as Lyx' to download the file to my pc. The ...

I am trying to recover my Lyx document that crushed and became 'not readable'. I found a solution from the past answer (see below), but I don't know how to remove the tilde from ***.lyx~ file. I cannot just rename it because it isn't a file name but a file type. I cannot also change the file type ...