Converting the FileSystemObject's Skip Method
Definition: Skip over the first n number of characters when reading a line from a text file.
Use Get-Content and the -totalcount paramenter to retrieve the first line from the text file. To skip the first 5 characters, start with item 5 (the sixth item in the array) and read the rest of the line up to the length of the array.
$a = Get-Content test.txt -totalcount 1 $a[5..$a.length]
Keep in mind that this code returns an array rather than a string. Also note that in Windows PowerShell 1.0, the -totalcount parameter works with only one line.