Hi Tim: Tried out some things and believe I have the answer. Its a bit involved so bear with me
When I told you that the vsarduino.h file was showing as read-only, that was as shown on the XP computer that the project originated on. I did not dream this, but no longer see the read-only tag when I look now- whether I have the project open or not in Studio. I'd say it was a "senior's moment" (I'm in my 60s) but I'm really sure of what I saw before.
However, the same error report still occurs when I try to load it on the 2nd (win7) computer. I had previously not looked at the file attributes on this computer- only on the originating XP.
So, now I see that the .vsarduino.h (full name is .powersupply2.vsarduino.h) is showing as HIDDEN but not Read-only. I can see the file in File explorer because I must have set it up to view hidden files in the arduino folder at some point in the past, I guess.
Tracking things down, I found that when I copy the folder to my WD Worldbook Network drive, this file is now hidden- i.e. it isn't visible to me. It's still there of course, and when I then copy the folder to my Win 7 computer, I can now see it, for the reason I mentioned above. If I now toggle the hidden flag off, the project now loads fine in Studio/VM.
Now it makes sense to me. I know from when I use Linux, the full stop at the start of a filename makes it a hidden file. The WD Worldbook NAS runs under Linux, so it is making the change on the file, even though it really should leave Windows files alone in this respect.
If it is not clear, I was copying the folder from XP -> WD NAS -> Win 7, and the WD NAS in the mddle was causing the problem.
But, I suspect that this may crop up for anyone using a network drive which is Linux-based, so you may see this again.
I really liked the docs done by Heinz that you gave me the link to. But, I deleted a lot of the VM forum emails, as they are just notifications, and I can't seem to find that link now.
Also, tonight I found the link to the VM Beta, which is what I should be using on the Win 7 computer as I had to put Studio 6.2 on it to get things to work. However, I couldn't find the beta link at that time, so I used the normal version. It is a bit obscure- if you just click the purple button marked download, which is right above the VM for 6.x wording, you don't get the BETA of course, but since it says 6.x, I didn't really worry about it.
If you use the downloads TAB, then you can see both versions, so I''ll reload my Win 7/studio6.2 computer with the beta VM.
I'll be licensing that machine next.
regards