Reply To: Executing program on remote computer help

The script block you pass to Invoke-Command does not inherit any variables from your local scope. In this case, $RemoteDll is an uninitialized (null) value when the command runs on the remote computer. You need to pass the value as an argument, and write the script block to accept positional parameters (either by name, or in the automatic $args array). For example:

$RemoteDll = "c:\program files (x86)\test\location\application.dll"

invoke-command -computername 'test-pc01' -ScriptBlock { & 'regsvr32' $args[0] } -ArgumentList $RemoteDll