Vista - Set-Content not updating file after get-content and forEach-Object

I have a file I need to append a value to the end of a specific line of text
(in a random location in the file).

First entry works (replaces text in file) second one does not update file at
the end of the line. I can't use the first entry because I can't do a
-replace.

1# (get-content $file) | foreach-object {$_ -replace "Group Membership","My
Membership"} | Set-Content $file

2# (Get-Content $File) | ForEach-Object {if
($_.contains("S-1-5-32-545__Members") -eq $true) {$_ = $_+",*S-1-5-4"
}} | Set-Content $File

Even though $_ is being updated with the new value, that new value is not
being passed on to the Set-Content command.

The if block changes the value of the object but it doesn't send it through
the pipeline; add another statement inside the block that will send the
changed object through. Also, need to add an else statement to output the
lines that don't match the if condition:

(Get-Content $File) | ForEach-Object {if
($_.contains("S-1-5-32-545__Members") -eq $true) {$_ = $_+",*S-1-5-4"; $_}
else {$_}} | Set-Content $File

You can also use -replace:

(Get-Content $File) | ForEach-Object {$_ -replace "S-1-5-32-545__Members",
"S-1-5-32-545__Members,*S-1-5-4"} | Set-Content $File

--
Kiron