@DareckSlava Sorry to hear you had a problem. Normally when a file is corrupted it happens when the file saving operation is interrupted. We’ve noticed this happens a lot with Windows 10 for some reason, but we’re still looking for clues on how to improve this.
For now, whatever you couldn’t save has been lost, so you can only recover what is already inside the file. Please follow this guide to try to recover whatever was saved in the file: Pencil2D Project File Corruption Prevention / Partial Recovery Guide