Customer who has ordered only a few
signs in the past, who sent their logo to us back then, calls and wants to know if we have their logo to send to them.
They claim they can't find the logo file.
Are they asking for the exact file that they sent you originally? If you do have that (sounds like you do not) then I would send that and only that without charging.
All we have are the Flexi files we created for the
signs we made. Would you go to the trouble to send them a logo file?
Not from that no. You can say that you can create one from the production files that you have, but that is going to cost.
What!? You took MY file and made it proprietary? I didn't ask you to do that! You need to fix it back the way it was and return my file just as I sent it to you, it's not yours!
"No, your logo file is still yours. These are however production files that we had to create in order to create your
signs. In order to fulfill our contract for creating
signs, this process had to be done. In some instances, it is a "destructive" process, meaning that it isn't easy to just revert back to a plain graphic file."
Now, the "destructive" bit may or may not apply in this case (it does in mine, that's why I mentioned it).
I don't use proprietary formats, but I do use some obscure tools, some of which are CLI only, so the odds of them being able to do anything with it are another thing entirely.