Command incompatible with current file type

[Essoje]

Attempting to use command() or numeric_command(1) while viewing an image from inside an archive like a zip will result in this message. If this is the expected behavior, please consider changing it; if it's not, please fix this.
I'm sure it's obvious, but being able to use external commands is quite valuable. Sometimes I need to open the specific subfolder where the current image resides and it works with images, but I'm unable to use this on archives because of this behavior.

[phillipberndt]

The reason for this behavior is that there's no obvious way to pass the offset into the image container to the command. I guess we could introduce a few extra variables to extend the behavior, e.g. $file is substituted with the container, $offset with the offset into the container, $display_filename with the name displayed to the user, etc., and then only display the error if a user doesn't make use of any of these variables.