Hi Thomas
It’s a bug. I’m not sure when this started happening, but the powershell api was returning a different object to what we were previously expecting. This build has the fix
https://downloads.finalbuilder.com/downloads/finalbuilder/800/FB800_2791.exe
Note that another option is the If File/Folder Exists action.
https://wiki.finalbuilder.com/display/FB8/Check+If+File+or+Folder+Exists+Action