Wow, thanks :). That's amazing that you could do that. Wish I'd checked back sooner, since I just re-wrote it myself too :) lol. I haven't written code in ages, so your version is much nicer (and probably less prone to exploading :) ). I know from the link NetWallah posted that different versions will do different things though (thanks, NetWallah, btw :) ). At anyrate, here's the ( pretty ugly ) I came up with:

use Win32::TieRegistry;

$PSTGuidLocation = "01023d00";
$MasterConfig = "01023d0e";
$PSTCheckFile = "00033009";
$PSTFile = "001f6700";
$keyMaster = "9207f3e0a3b11019908b08002b2a56c2";
$ProfilesRoot = "Software\\Microsoft\\Windows NT\\CurrentVersion\\Wind
+ows Messaging Subsystem\\Profiles";
$DefaultOutlookProfile = "Software\Microsoft\Windows NT\CurrentVersion
+\Windows Messaging Subsystem\Profiles";
$DefaultProfileString = "DefaultProfile";

$defaultProfile = 

$Registry->{"CUser\\$ProfilesRoot\\$DefaultProfileString"};

print "\nDefault Profile: $defaultProfile\n\n";

$profileName = 

$Registry->{"CUser\\$ProfilesRoot\\$defaultProfile\\"};

$" = "\n";

@thePSTList = GetPSTsForProfile();    

print "@thePSTList";

sub GetPSTsForProfile{

    #This will fetch the $MasterConfig key where the location of pstfi
+les is stored.

    my @valueNames = $Registry->{"CUser\\$ProfilesRoot\\$defaultProfil
+e\\$keyMaster"}->GetValue($MasterConfig);
    
    #get the data out of the list the above line returned.
    $strValue = @valueNames[0];
    
    #this line of code does a lot -> 
    # 1. The call to unpack use's the H* Template to turn everything i
+n $strValue into a large Hex String.
    # 2. The call to split breaks it up into an array of 3 strings, bu
+t leaves some entries that are just 
    #    white space.
    # 3. The call to grep prunes out the whitespace and anything that 
+isn't 16 binary digits
    #    by matching array elements that are 32 characters long (since
+ each character is a 
    #    binary digit.
    # 4. All done, we now have the contents of the '01023d0e' registry
+ value in a convient List
    my @hex = grep ( /.{32}?/, split(/(.{32,}?)/, unpack('H*', "$strVa
+lue") ) ); 
    
    foreach $pstLocString (@hex) {
    
        #If IsAPST(r_ProfilesRoot & "\" & p_profileName & "\" & strPST
+Guid) Then
        
        #if it's not a PST, skip it.
        if ( !IsAPST($ProfilesRoot . "\\" . "$defaultProfile" . "\\" .
+ $pstLocString) ){ 
            
            next;
        
        }#end if.
        
        $curPSTLocation = PSTLocation("$ProfilesRoot\\$defaultProfile\
+\$pstLocString");
                
        push(@pstPathList, PSTFileName("$ProfilesRoot\\$defaultProfile
+\\$curPSTLocation") );
    
    }#end foreach
                
    return @pstPathList;

}#end sub GetPSTsForProfile.

sub IsAPST {

    #copy the function parameter into a scalar for readability.
    
    $PSTGuid = $_[0];

    #Get the key from the registry that indicates whether this is a ps
+t or not.        
    
    my @valueNames = $Registry->{"CUser\\$PSTGuid"}->GetValue($PSTChec
+kFile);

    # Just like before in the main GetPSTsForProfile function, this do
+es a lot...
    # 1. The call to unpack use's the H* Template to turn everything i
+n $strValue into a large Hex String.
    # 2. The call to split breaks everything up into binary digits 
    #    i.e. it makes a list with every two characters from the Hex S
+tring as an element.
    # 3. The call to grep discards any elements that are just blank sp
+ace.
    
    @PSTGuildValue = grep ( /./, split( /(.{2,}?)/, unpack( 'H*', @val
+ueNames[0] ) ) );
    
    # Finally, if the first element of @PSTGuildValue equals 20, it's 
+TRUE that this is a PST, otherwise it's false.
    #    return accordingly. 
    
    return @PSTGuildValue[0] == "20";
    

}#end sub IsAPST

sub PSTLocation {

    #copy the function parameter into a scalar for readability.
        
    $PSTGuid = $_[0];
            
    my @valueNames = $Registry->{"CUser\\$PSTGuid"}->GetValue($PSTGuid
+Location);
    
    $PSTlocation = unpack( 'H*', @valueNames[0] );
    
    return "$PSTlocation";

}#end sub PSTLocation

sub PSTFileName {

    $pstLocationString = "";

    #oReg.GetBinaryValue HKEY_CURRENT_USER,p_PSTGuid,r_PSTFile,P_PSTNa
+me
    
    #copy the function parameter into a scalar for readability.
            
    $PSTGuid = $_[0];
    
    #This fetches the file name data out of the registry and stores it
+ into @valueNames.
    my @valueNames = $Registry->{"CUser\\$PSTGuid"}->GetValue($PSTFile
+);
    
    # @valueNames[0] has the path, but there are extra spaces between 
+every character that are added 
    #    into the registry. Ths splits the @valueNames string into the
+ @pstChars list, so we now have
    #    a list with every character of the path (and each of those ex
+tra spaces) as an element.
    @pstChars = split(//, @valueNames[0] ) ;
        
    #This for loop selects every other item in the @pstChars array, si
+nce every other item is a valid character
    #    and the items in between are worthless spaces added into the 
+registry. 
    #    each element is stored in $pstLocationString.
    for ($i = 0; $i < (@pstChars - 1); $i += 2){
    
        $pstLocationString .= $pstChars[$i]
    
    }#end for loop
    
    #for the sake of completeness, removing any trailing spaces.
    $pstLocationString =~  s/\W+$//;
        
    return $pstLocationString;
    
}#end sub PSTFileName

#this is a debugging function, it prints the keys of a hash, and gets 
+used for printing the hash returned by calls to
# $Registry->...
sub printRegKey{

    foreach $myKey (keys %{ $_[0] } ){
    
        print "$myKey\n";
    
    }#end for Each.

}#end sub printRegKey
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