I am using this https://sourceforge.net/projects/ai2offline/
I understand but i don't know who made it. 
Can't I recover it this way?
AI2 \ war \ WEB-INF
I do not know what to do
there are many people who want to build their own App Inventor.
I could not find any solution
To many........
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Export the aia file, I will try to remove unnecessary blocks. What extension did you remove?
Do you know a way to do this?
No, never had this problem and always made backups. Especially when using an offline version.
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So what should i do
Export the aia file, it will try to remove unnecessary blocks. What extension did you remove?
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I can't get aia file.
"RandomGenerator extension"
If you can't export aia, then you won't do anything. Delete the project and create a new project with backup. Better to use ai2 online too.
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Is your Offline version set to auto load the last used project?
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You should be patient when exporting the project. Is it a big one?
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no. There is nothing in it. There are only blocks
I closed the project without saving.
Never opened again