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When I open a plain text file in chrome and choose save as, how can I change the extension in the "save as" dialog in Chrome?

For example consider this file:

When I try to save that file I get this dialog: enter image description here

Changing the text in the textfield to the following does not work:

Tubster.tmTheme    ->  Tubster.tmTheme.txt
"Tubster.tmTheme"  ->  "Tubster.tmTheme".txt

Is there a way of saving this as Tubster.tmTheme?

I'm using Mac OS, so this may only be a problem on that OS.

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up vote 1 down vote accepted

You have to expand the dialog by clicking the triangle after the "Save As" textfield.

Then if you try to save the file as Tubster.tmTheme, Chrome will give you a dialog, where you can use the .tmTheme extension.

enter image description here

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