This script works with both normal and gzipped files

from __future__ import print_function 
import gzip
import os
import os.path
import sys

# =====================================================
class _dialogs:
    def get_folder( self, start = "" ):
        style = ( wx.DD_DEFAULT_STYLE | wx.DD_NEW_DIR_BUTTON )
        dialog = wx.DirDialog( None, 'Select a Folder ', start , style )
        return dialog.GetPath() if dialog.ShowModal() == wx.ID_OK else False
# =====================================================
def read_lines( lines, isgzipped, references = [] ):
    if isgzipped:
        lines = lines.split("\n")
    for line in lines:
        if "Runtime" in line.title():
            if not line.lstrip() in references:
                references.append( line.lstrip() )
    return references
# =====================================================
def has_extension( object_type ):
    try:
        ext = os.path.splitext( object_type )[1]
    except:
        ext = None
    if ext:
        return True 
    else:
        return False
# =====================================================
def is_gz_file(filepath):
    with open(filepath, 'rb') as check_gz_status:
        return check_gz_status.read(2) == b'\x1f\x8b'
# =====================================================
def print_references( references ):
    if references:
        for ref in references:
            print( ref.rstrip() )
# =====================================================
def legal_file_types():
    return  ('.pz3','.cr2','.pz2','.pp2','.hr2','.fc2','.hd2','.lt2','.cm2','.mt5','.mc6',
        '.pzz','.crz','.p2z','.ppz','.hrz','.fcz','.hdz','.ltz','.cmz','.mz5','.mcz')
# =====================================================
use_exts = legal_file_types()
searchfolder = _dialogs().get_folder()  
underline = '-'*30
references = []
sysop = False
# =====================================================
if searchfolder:
    list_of_files = os.listdir( searchfolder )
    for file in list_of_files:
        file = os.path.join( searchfolder, file )
        if file.endswith( use_exts ):
            if has_extension( file ):
                if sys.version_info.major == 3:
                    sysop = True
                    print( f"\n\nExamining {file}\n{underline}\n" )
                elif sys.version_info.major == 2:
                    sysop = True
                    print( "\n\nExamining {}\n{}\n".format( file, underline ) )
                else:
                    sysop = False
                    print( "Python 2 or 3 is required to run this file.")
                if sysop:
                    if not is_gz_file( file ):
                        try:
                            with open( file, "r" ) as lines:
                                references = read_lines( lines, False, references )
                                print_references( references )
                        except:
                            continue
                    else:
                        if not file.endswith( ignore_exts ):
                            with gzip.open( file ,'rb' ) as lines:
                                lines = lines.read()
                                lines = lines.decode("utf8")
                                references = read_lines( lines, True )
                                print_references( references )
            references = []
# =====================================================

this gives an output resembling this:

Examining x:\\Poser\\Runtime\\Libraries\\Character\\Creepy Kid Too\\Creepy Kid 2 WM 9+.cr2
------------------------------

figureResFile :Runtime:Geometries:Creepy Kid Too:Creepy Kid Too.obj
textureMap ":Runtime:Textures:Creepy Kid Too:TeethGums.jpg"
file ":Runtime:Textures:Creepy Kid Too:TeethGums.jpg"
textureMap ":Runtime:Textures:Creepy Kid Too:EyesTex.jpg"
file ":Runtime:Textures:Creepy Kid Too:EyesTex.jpg"
reflectionMap ":Runtime:Textures:Creepy Kid Too:EyesTex.jpg"
bumpMap ":Runtime:Textures:Creepy Kid Too:TeethGums.jpg"
textureMap ":Runtime:Textures:Creepy Kid Too:Body.jpg"
file ":Runtime:Textures:Creepy Kid Too:Body.jpg"
file ":Runtime:Textures:Creepy Kid Too:displace.jpg"

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