Please select an Underrail archive to unpack it, or any other file to pack it.
Repack files back to their original version to ensure compatibility. The patch list here is no longer actively maintained, but version data are taken from unpacked files. This should work all foreseeable future versions, unless Styg changes the Underrail file format or starts encrypting saves.
Unpacked files are game data serialized to .NET binaries. (MS-NRBF spec) Being binary files, they aren't completely human-readable and a hex editor is required to edit them.
NB: 7-zip also works for this. Extract an Underrail archive with 7-zip, edit the extracted file as desired, open the same archive in 7-zip file manager, throw your edited file back in. Doing it that way will preserve the archive's custom Underrail headers.
Pack to version