@gopostal
Be sure to always grab yourself the most up-to-date version of CodeWalker from it's Discord .
v29 is over 3 years out of date now, & missing a lot of new features/functionality.
If that doesn't fix it, here's something else you might try:
Open CodeWalker's RPF Explorer (CW > '[<<]' > 'Tools...' > 'RPF Explorer...') Search for '_manifest.ymf' (in the top right search box) & pick one at random Right-click it & select 'Export XML...' & select a location to save the file Open the exported '_manifest.ymf.pso.xml' with a Text Editor (Notepad++ etc) Replace the contents of the file with the generated text you copy from within CodeWalker & save the file Back to CW's RPF Explorer, navigate to the location in the game files that you want the '_manifest.ymf' to be (any location will do really, as file can be moved after anyway) Enter Edit Mode using the '[ Edit mode]' button (left of search box) & accept the warning. Right-click anywhere within the folder & select 'Import XML...' & import your edited '_manifest.ymf.pso.xml' A few seconds later, your '_manifest.ymf' should appear in the folder.