Just downloaded IDE 2.0.4 Now get masseage about saving sketch

Development Tools IDE 2.x
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Now I get the follow message that, "The name must start with a letter or a number, followed by letters, numbers, dashes, dot or underscores.
I'm starting my sketches with a letter. What's up?
Douger

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I'll add, even files I saved in 2.0.3, when open give this message and then I can't run them because of the message.
Douger

3

Arduino specification does not allow spaces in a filename. The latest version checks that filenames conform to the specification.

4

Glad I just started and only have 10 minor sketches to rename.
I found the program seems to add underscore between words, when say Yes.
The name now ends with .ino, what does that stand for or mean?

                        Thank you for the info, Douger
5

.ino is the file extension for Arduino programming language files:

https://arduino.github.io/arduino-cli/0.31/sketch-specification/#sketch-folders-and-files:~:text=The%20following%20extensions%20are%20supported

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