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For some reason, /play -c seems to demand a target window or nickname, when none should be needed.

Should work but doesn't: /play -c file.txt
Should work but doesn't: /play -c file.txt 1000

Specifying an arbitrary target parameter seems to work, but it's weird. Example uses a hyphen.

Works but seems weird: /play -c - file.txt
Works but seems weird: /play -c - file.txt 1000

Understandably a target would be useful if context sensitive commands like "/say" or "/me" are used.
So targets should be allowable, but not mandatory.
Thanks for your bug report. This is intentional. If you want /play to interpret lines as commands, you will need to specify a target window. I have updated the help file to clarify this.
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