First, thank you for trying to help. I attempted to do what you had listed in your article, after saving the fle as an .idml, and trying to reopen it InDesign refuses to do so. Saying that I don't have the right plug-ins. I also when this first happened tried the same method and it had that error as well.
The error message reads:
"Cannot Open the File ---.idml. Adobe InDesign may not support the file format, a plug-in that supports the file format may be missing, or the file may be open in another application."
I have opened several .idml files within the last week so I have no clue why it might be doing this. Those .idml files were from CS6, and many times I'm also unable to open those files due to those files coming from a Mac.
I also today uninstalled my Kindle converter for InDesign thinking it might have been one of the issues.
I just wanted to let you know I think I fixed the problem. For some reason the file apparently became corrupt. Thanks to Dropbox and it's restorations I figured out that the last time I saved or the last work period that Dropbox has on account something happened. So I restored the file to the one before and it seems to be working fine. I have no clue what happened, but I'll just have to redo the work I lost. It also seems that some of my other InDesign files are working fine, which I should have checked before.
Thank you for the help.
Glad you got that straightened out.
The error message you see is typical of trying to open a corrupt file. You would see a missing plugins error whne trying to open a CS 6 file in CS5.5. PC or Mac should make no difference at all.