You're telling it to replace "backup/stg2enm.png" contained in "stg2end.anm" with the file "stg2enm.png". The error message is telling you that this file was not found in the archive, not on your disk. Are you sure you haven't reversed the two files? Try this...
thanm r stg2enm stg2enm.png backup/stg2enm.png
Usage: thanm COMMAND
COMMAND can be:
...
r[OPTION...] ARCHIVE NAME FILE replace entry in archive
...
OPTION can be:
f ignore errors when possible
I tried that and still says the same thing:
thanm: stg2enm.anm: stg2enm.png not found in archiveI think it's because the file "stg2enm.png" is there, but isn't that name in "stg2enm.anm" but I'm not sure, just in case this helps:
These are the PCB files (th07.dat)
I extracted the files with Brightmoon
I created the .png images of the .anm with anm2png
I modify the images of Chen (stg2enm.png) with photoshop
Also let me know if the .png can be converted into .anm with datpacker