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How to avoid file download, if the file is already present in my local.

My Code: < a href="file:///C:/Users/t_smrithik/Desktop/DNS.cap">DNS.cap

I do not want to download this file again. I just want to open it. The file gets downloaded to a temp folder and then the Wireshark app(app used to open cap files) loads it.

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Javascript cannot access the filesystem and check for existence. The only interaction with the filesystem is with loading js files and images (png/gif/etc).

Javascript is not the task for this

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