Ok
@Motorsport-e3 , you seem most of the way there. I've just checked how I've done this before as I've not done it for a few months and the way I do it, I save the original PDIPFS folder in the same folder with GTTOOLSHARP. I renamed he PDIFPS folder PDIPFS_ORIGINAL (you can't leave have spaces in the folder names IIRC) so one thing that might be causing trouble is the folder "decompression gt5" but not 100% sure on that.
Also, the path seems incorrect you seem to be missing the first part of the command line. For example, mine is also on the desktop but the path to my folder is: GTToolsSharp unpack -i C:\Users\davea\Desktop\GT6_Modding\GT6_v1.22_Modding\GTToolsSharp.exe\PDIPFS -o C:\Users\davea\Desktop\GT6_Modding\GT6_v1.22_Modding\GT6_1.22\PDIPFS
You need to direct it to the desktop location on your hard drive.
Just to make sure you're getting it right, to run CDM from the folder you go into the folder where gttoolsharp.exe is located and type in "CMD" here:
View attachment 1535141
Then from CMD you insert your command to unpack the file.
You only type the input command once you are ready to re-pack, the file path should again follow the same format where it directs to the unpacked file location on your hard drive and includes the initial part of the command line.
So the input command should start: GTToolsSharp pack -i PDIPFS -p C:\Users\davea\Desktop\GT6_Modding\GT6_v1.22_Modding\GT6_1.22\PDIPFS -o C:\Users\davea\Desktop\GT6_Modding\GT6_v1.22_Modding\New
That should run the unpacking and repacking commands correctly which depending on how many files you are extracting can take a few minutes, and then the extracted (or repacked) folders will appear where you've requested them to appear.