Cannot export my project

i am not able to export my projects as when i open the file on acrobat reader or microsoft word it shows that this file is either decoded or something like that please help

Welcome to the community. Project file/aia is a zip type file and can be extracted with 7zip or winrar or a similar program (this is used in special occassions).
Aia files can not be opened and edited by a program in your pc, only at ai2.appinventor.mit.edu .

Same thing for app/apk files, can not run in pc unless you have an android emulator

In order to save project see

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The Blocks Editor has a feature that lets you Download Blocks as Image if you want to show others parts of your app in a document. I do it for procedures and events in my sample apps.

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