Paint can't read a file created in Paint PLEASE HELP!

Last night, I created an image in paint and saved it as a PNG image like I always do in my Jump Drive (exterior drive, USB drive, etc. there's many names but I call it jump drive) but today I was unable to open it saying: "Paint cannot read this file. This is not a valid bitmap file, or it's format is not currently supported." I didn't alter the image in any way in any other program and I can open it in the photo viewer. Please respond, I'm very nervous I'll lose it and I've worked on it for days and I'm very new to this so I don't know much about computers and this is my 1st time asking for help so I have no experience with computers and please make it as simple and easy as possible explanation. PLEASE HELP! I worked very hard on these drawings as I am a digital artist and it took a while to get color and draw the image right.

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