Forbidden file names

[WeirdWorkings]

What I’m trying to do

I have been using three letter codes for filenames. All works fine, except that for some reason the filename “CON” is forbidden. Why is it forbidden and are there others?

[WeirdWorkings]

[joethei]

It depends on the operating system, here is a pretty good list

What characters are forbidden in Windows and Linux directory names?

[Pch]

This could help you out …

List of all forbidden filename characters

As of v1.8.10., this is the full list of characters that Obsidian does not allow to put in filename from within the app. As shown by the red tooltips that appear when you attempt to input a forbidden character in a filename. All OSes: []#^| Filename must not start with a dot. macOS, iOS, iPadOS and Linux: \/: Windows: *"\/<>:|? Android: \/:*?<>"

As well as this (for Windows at least): https://learn.microsoft.com/en-us/windows/win32/fileio/naming-a-file#naming-conventions

It states somewhere in there :

• Do not use the following reserved names for the name of a file:

  CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, COM¹, COM², COM³, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, LPT9, LPT¹, LPT², and LPT³. Also avoid these names followed immediately by an extension; for example, NUL.txt and NUL.tar.gz are both equivalent to NUL.

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Edit: I didn’t see Joethei reply above due to a connexion hiccup
Please, don’t mind me

[WeirdWorkings]

So it is just reserved. That’s annoying, but thank you for helping me understand.