IDLE: Option to warn user on "Run Module" if file is not Python source

[wyz23x2]

BPO	41434
Nosy	@terryjreedy, @roseman, @wyz23x2, @E-Paine

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2020-07-29.06:54:57.780>
labels = ['expert-IDLE', 'type-feature', '3.8', '3.9', '3.10']
title = 'IDLE: Option to warn user on "Run Module" if file is not Python source'
updated_at = <Date 2020-10-23.15:59:54.677>
user = 'https://github.com/wyz23x2'

bugs.python.org fields:

activity = <Date 2020-10-23.15:59:54.677>
actor = 'markroseman'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2020-07-29.06:54:57.780>
creator = 'wyz23x2'
dependencies = []
files = []
hgrepos = []
issue_num = 41434
keywords = []
message_count = 5.0
messages = ['374561', '374562', '374568', '374571', '379448']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'markroseman', 'wyz23x2', 'epaine']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41434'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[wyz23x2]

It would be great if IDLE shows a note when a non-Python file is attempted to run.

[wyz23x2]

It should be able to turn on/off this feature.