Safest way to run BAT file from Powershell script

Question

I can not get a powershell script to execute a bat file directly. For example, this works on the command line:

.\\\\my-app\\my-fle.bat

When

Answer 1

Assuming my-app is a subdirectory under the current directory. The $LASTEXITCODE should be there from the last command:

.\my-app\my-fle.bat

If it was from a fileshare:

\\server\my-file.bat