Hello Jan,

just give a file the readonly attribute. Then open this file in PSPad. 
For comparison open an additional file that is not readonly.

If "Settings|Program Settings|Tools|File locking" is set to "Lock file with R/O
attribute" then PSPad shows a Message, that the file is readonly. After you have
closed this message you will not notice any differences in the editor window
between the readonly and the not-readonly file unless you try to save them.

Now repeat the same procedure with PSPad "Settings|Program Settings|Tools|File
locking" is set to "Don't lock file when open".
You will have the filename of the readonly file marked with a square on the tab
and you will not be able to make any changes in the editor!

Additionally to a message this second beheaviour would be the right one in our
opinion for every chosen method also including "Smart file locking with LCK
file".

Greetings and many thanks for your patience
Dirk

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