It worked fine the first time - and I don't have issues with any other old files - but now I get the error message "Cannot open".
Does that mean you opened it, then saved in the new version, and now it will not re-open? If so, did you have the good sense not to overwrite the old file, or do you have a backup copy?
No I didn't save the new version Peter. I just opened it to see if everything worked okay, and by all accounts it did until I tried to open it again later.
I have been trying to find my backup copy but to no avail. I have different versions of the same document but in other languages, so worst case scenario I could rebuild it using one of those but it would be a big job! File recovery would be my preference if at all possible...
OK, good. At least you didn't destroy the old file and maybe it's still OK.
Do you still have CS3 installed someplace? Does the file open there? If it does, export to .inx (InDesign Interchange format) and open that in the new version (this is best practice for conversion, anyway). If it no longer opens in CS3 there's a problem now with the file.
Did you see any sort of error message when you last tried opening the file?
I do still have CS3, but no it doesn't open there any more.
The error message simply says: Cannot open "Education Southland prospectus.indd".
Well that's not good. Nothing more to the message?
Sounds like maybe the file got damaged. Is it stored locally on your hard drive, on removable media, or on a network?
And what's your OS?
That's all the message says! Not very helpful, I know.
The file is on a USB stick.
Ouch. Not much help now, but working off a USB stick is REALLY dangerous. Those things take longer to close files than people realize and pulling them out before things are done can cause real damage.
There's a free tool that might help, though: Repair corrupt InDesign Adobe files on Mac OS X
But keep looking for that backup.
Just tried that repair tool, but it doesn't support CS3 files unfortunately.
Thanks for your help, Peter. Time for a strong whiskey, methinks!