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If I open a PHP file, it stays gray as it has always been. Do I have to include the PHP file in a solution in order to be able to work on it using your extension?

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This is typically caused by an old settings in Visual Studio, where .php files were probably assigned with an other editor in Visual Studio.

In VS, please try to File -> Open -> File, choose some .php file, and click Open With. A dialog should be opened, where you have to select PHP Editor and “Set as Default”.

This is common issue. I hope this will help.

Thank you very much for your help. The first time, I opened the PHP file by dragging and dropping it on top of Visual Studio; now that I have gone through your steps, it works fine every time I open a PHP file.

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