Is it possible that Portable is writing something of a config nature to the local hard drive and not the thumb drive?
The reason I ask is that I just did a test. I freshly formatted a thumb drive, downloaded Portable 0.8.52 from the web site directly to that thumb drive. I then extracted the folders, went to the Calibre Portable folder, double-clicked on calibre-portable.exe and immediately got the "handle is invalid" error shown in my initial post.
I have a large library of about 21GB with over 14,000 books in it that I need to do a lot of cleanup on. Author names, titles, etc. that are inconsistent due to the various sources I have obtained them from. My intent is to use Portable with the library on a thumb drive so I can work on this library whenever I have a chance, on any machine I can access. Be it work desktop, work laptop, home desktop, home laptop, etc.
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