Can't Open ISO in Shishi Sprite Editor

[tommyorwhatever]

I'm sorry if this issue has been addressed... but all of the tutorials I've been watching/reading say to just open the ISO in Shishi Sprite Editor. But when I try I get this error that I screenshotted and attached to this post. I don't see anyone else having problems like this, but I feel like I'm missing a step in the process. Any help anyone can offer would be greatly appreciated.

[Angel]

Using WotL is asking for trouble.

Are you using the most recent version of Shishi?

[tommyorwhatever]

I'm using the one included in the FFTPatcher.482. Is that not the most recent one?

[Nyzer]

Your ISO is set to Read Only. Mine opened fine with both a newer and an older version of Shishi. Then I set it to Read Only, and the result is below.

[tommyorwhatever]

thank you! this helped.