Converting the FileSystemObject's Write Method
Definition: Writes a string (without a newline character) to a text file.
In VBScript, the string either replaces all existing content or is appended to the end of the file, depending on whether the file was opened ForWriting or ForAppending.
In PowerShell, content is appended using the Add-Content cmdlet:
Add-Content C:\Scripts\test.txt -value "New Content"
If you want to overwrite existing content, first call the Clear-Content cmdlet:
Clear-Content C:\Scripts\test.txt Add-Content C:\Scripts\test.txt -value "New Content"
Note that in PowerShell a newline character is always appended to the end of the line.