DjVu thumbnails in 2.0 doesn't work

[EvilPunker]

I had previously installed DjVu Shell Extension Pack from Cuminas to generate DjVu thumbnails. I uninstalled it and updated DarkThumbs to version 2.0. I checked DJVU checkbox, but see no thumbnails for DjVu files. ePub & FB2 still work ok.

[fire-eggs]

The first question has to be whether you wiped the thumbnails cache. Windows caches the thumbnails (even those "blanks") and new formats such as DJVU won't appear until the cache has been cleared. Something DarkThumbs can't make happen on its own, alas.

[EvilPunker]

The first question has to be whether you wiped the thumbnails cache.

Yes, i did, but it didn't help

[fire-eggs]

Righto. New feature, bound to be some teething troubles.

Could you provide one or two DJVU files that aren't working for you? So I can confirm it's not the support library at fault. After that, I'll make up a diagnostic version of DarkThumbs, if you're willing to give it a try.

[EvilPunker]

Could you provide one or two DJVU files that aren't working for you? So I can confirm it's not the support library at fault. After that, I'll make up a diagnostic version of DarkThumbs, if you're willing to give it a try.

https://drive.google.com/file/d/1IrE5aQ5NQ4RvINqtCbDb5cbvaLZy_qoy/view?usp=sharing

Also tested file path and name. Doesn't affect at all - still no thumbnail

[fire-eggs]

Thank you for the file. It worked for me in my Windows 10 test:

I'll provide an update when I have diagnostics ready.

In the meantime, one test you could try would be to:

1. Create a new folder (possibly consider doing so from the command line).
2. Copy a number of DJVU files into that folder (again, possibly via the command line).
3. View that folder in File Explorer, large icon mode or whatever to see if DarkThumbs creates thumbnails.

With a brand new folder, there "should" be no existing thumbnail cache.

[EvilPunker]

3. View that folder in File Explorer, large icon mode or whatever to see if DarkThumbs creates thumbnails.

Did as you siad. Still no proper thumbnails. Added FB2 & ePub for control:

[EvilPunker]

The problem is in this Registry key (I removed it and now see all DjVu covers)
Computer\HKEY_CLASSES_ROOT\SystemFileAssociations\.djvu\ShellEx\{e357fccd-a995-4576-b01f-234630154e96}

It overrides other key in
Computer\HKEY_CLASSES_ROOT\.djvu\shellex\{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}

[fire-eggs]

Yup, after sleeping on it last night, I wondered if it might have been a Registry issue. Glad you found it!