When i try to PDFView Command in Winshell I'm getting the below error. I'm using Winshell 18.104.22.168
This fixed the problem for me.
Long story short: it seems that AcrobatReader is sometimes very unhappy with relative paths to a file so you have to spoonfeed him the absolute path. This can be done by using the following script instead of the plain Reader executable:
@start "" "C:\path\to\where\you\have\AcroRd32.exe" "%~f1"
What disturbs me a bit is that the post that solves the problem is from 2008 but the problem occurred after a very recent update.