[vbat99]

Part rar format should work OK with mediacompanion, but I'll took into it as this area has not been checked over for a very long time.

So I'd say...it use to work...

That said, I thought movies in rar were formatted as:
Movie A.rar
Movie A.r01
Movie A.r02
Etc...

And you set the split at 4 gig. Or is that not the only way to have them?

Cheers for the reply vbat99 :-)

That's (my names above) the way current version of WinRar spits the file names out by default now.

They are set in WinRar to:

1. Archive format: Rar4 (otherwise Kodi ignores them)
   
2. Compression method: Store
   
3. Split to columns, size: 4095MB (Fat32)
   

Checking Advanced > Volumes > Old Style Volume Names in WinRar does get me:

Movie A.rar
Movie A.r00 <- note starts at 00 not 01
Movie A.r01

...but still ignored by MC :-(

Manually renaming to:

Movie A.rar
Movie A.r01
Movie A.r02

..still no joy :-(

For ref, in ths particular scenario, I'm using it for USB drive connected to a FireStick running Kodi via an OTG cable. V useful for taking a stack of movies away when all you can guarantee is a tv with HDMI. Downside is Fire stick only mounts FAT32 format drives - hence the rar files for movies over 4GB.

As in my OP, Kodi plays the rars no problem via the "files" menu, so I have the basic functionality I need out of the box... but it would be nice to have the scanned into the library and accessible that way with posters, etc.. :-)

So I have been looking into this and MediaCompanion is scraping the files correctly no matter if
Z:\Movies\Book Club (2018)\Book Club (2018).part1.rar
Z:\Movies\Book Club (2018)\Book Club (2018).part2.rar
Z:\Movies\Book Club (2018)\Book Club (2018).part3.rar
Z:\Movies\Book Club (2018)\Book Club (2018).part4.rar
or as
Z:\Movies\Big Hero 6 (2014)\Big Hero 6 (2014).rar
Z:\Movies\Big Hero 6 (2014)\Big Hero 6 (2014).r00
Z:\Movies\Big Hero 6 (2014)\Big Hero 6 (2014).r01
Z:\Movies\Big Hero 6 (2014)\Big Hero 6 (2014).r02
And creating the nfo correctly.

The issue seems to be with Kodi not scraping the local nfo. From what I have seen, Kodi looks into the rar archive, pulls out the movie title, and then stops.
If I switch from Local Information Only scraper to TheMovieDb scraper, then Kodi goes online, scrapes the movie, and it is added to the Library.
I exported the library to check the naming of the nfo, and it matched MC's naming.
I then opened a new instance of Kodi, added the source and set to Local Information Only, and again Kodi did not add to the Library even with its own exported nfo file.

It seems as though if the multipart is in Rar format, then unless you are scraping from TheMovieDb in Kodi, then the movie will not be added to the library.

You mentioned that you use Rar format because your storing on a Fat32 partition and I see the Firestick does not support NTFS.
I would recommend then looking at a program to split the video file into less than 4Gig sections. It would take about the same amount of time as archiving the movie into Rar files.

So, Sorry, but this seems to be an issue in Kodi relating to Rar files.