正好有这个需求，查到的这个项目：

notscuffed/repkg

下面几张截图粗略演示方法：

打开Visual Studio编译RePKG项目，然后：

随便打开个terminal跑一下就行：

如果你高兴的话，甚至可以把这个路径加入环境变量：

setx /m PATH "%PATH%;新的路径"

这条命令慎用，可能产生麻烦的后果

下面为项目README，项目遵循的是MIT协议：

RePKG

Wallpaper engine PKG unpacker/TEX converter, written in C#.

PKG and TEX formats reverse engineered by me.

Feel free to report errors.

Features

• Extract PKG files
• Convert PKG into wallpaper engine project
• Convert TEX to image
• Dump PKG/TEX info

Commands

• help - shows those commands, use help "extract" and help "info" to see options for them
• extract - extracts specified PKG/TEX file, or files from folder

-o, --output          (Default: ./output) Output directory
-i, --ignoreexts      Don't extract files with specified extensions (delimited by comma ",")
-e, --onlyexts        Only extract files with specified extensions (delimited by comma ",")
-d, --debuginfo       Print debug info while extracting/decompiling
-t, --tex             Convert all TEX files into images from specified directory in input
-s, --singledir       Should all extracted files be put in one directory instead of their entry path
-r, --recursive       Recursive search in all subfolders of specified directory
-c, --copyproject     Copy project.json and preview.jpg from beside PKG into output directory
-n, --usename         Use name from project.json as project subfolder name instead of id
--no-tex-convert      Don't convert TEX files into images while extracting PKG
--overwrite           Overwrite all existing files

• info - Dumps PKG/TEX info

-s, --sort             Sort entries a-z
-b, --sortby           (Default: name) Sort by ... (available options: name, extension, size)
-t, --tex              Dump info about all TEX files from specified directory
-p, --projectinfo      Keys to dump from project.json (delimit using comma) (* for all)
-e, --printentries     Print entries in packages
--title-filter         Title filter

Examples

Simply extract PKG and convert TEX entries into images to output folder created in current directory

repkg extract E:\Games\steamapps\workshop\content\123\scene.pkg

Find PKG files in subfolders of specified directory and make wallpaper engine projects out of them in output directory

repkg extract -c E:\Games\steamapps\workshop\content\123

Find PKG files in subfolders of specified directory and only convert TEX entries to png then put them in ./output omitting their paths from PKG:

repkg extract -e tex -s -o ./output E:\Games\steamapps\workshop\content\123

Convert all TEX files to images from specific folder

repkg extract -t -s E:\path\to\dir\with\tex\files