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Having trouble unzipping Zipfiles from reputable source. I get error message Invalid Zipfile Header when extracting an application file, but OK for a Welcome text file. Later in same process I get Internal Error in Sparkplug; then it opens, but resultant file doesn't seem large enough. Tried downloading latest free version of Sparkplug, with same result.

Could this be because this is in VRPC?

I've never had any problems when using SparkeFS. Whilst it's the "full" product the compression routines are the same. Try de-compressing the archives using !Zipee instead as some versions of Sparkplug don't correctly support long file names.