DJ_Unique has released a new version of ScriptEd, which will hopefully help the modders out there with all your scripting endeavours. </blockquote><a href="http://www.terra-arcanum.com/downloads/arcanum/tools/ScriptEd_1_50-beta-build2-setup.exe">Get it here!</a> Now, this is not the final version, and therefore it may still have a few unresolved odds and ends (that's why it's called Beta, after all). For more information regarding what this little tool does and doesn't, </blockquote><a href="http://www.terra-arcanum.com/phpBB/viewtopic.php?t=14836">check this thread!</a> Thanks DJ_Unique!
You should probably report the error in the thread DJ-Unique made about it, which I linked to in the original post (and, being the lazy bastard I am, won't bother to retype into this reply )
These kind of errors are difficult to troubleshoot with that little information. It tries to open Arcanum3.dat but something is wrong with the path name. I can't say any more without more information. I have tried various situations: whitespaces in ARcanum installation folder (no error), rename arcanum3.dat to something else (File not found instead of invalid filename) so I just can't tell what's going on. There is a file called datlib.log that logs all DAT operations so the contents of that log file would be appreciated, helps me a bit to determine the cause of this. It's saved to your ScriptEd installation folder.
I noticed that my errors with 1.50 Beta build 2 gave me the option to e-mail them to DJ_Unique. You might want to do that.
An upgraded script editor is quite a surprise to me. Sure the old one was quite rough but I wouldn't think anyone would actually bother to go through with such an idea. A great gift for the modding community, thanks Dj_Unique !