Post by Lumin0usOrbit in SaiThumbs comments

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Heya, so umm, ran into a few problems installing it either with the .bat files and manually. My W10 version is 22H2, my LUA is enabled, and I dismarked "Always show icons, never thumbnails". Here's the thing:

System: Windows 10 22H2 (64-bit), installed on C:

I store my Sai2 in an external disk (F:)

Regsvr32 shows "DllRegisterServer succeeded" when registering from the SAI 2 folder or System32.

Thumbnails still don't show. The explorer just displays the default SAI 2 icon even after:

-Cleaning thumbnail cache (both via Disk Cleanup and manually deleting thumbcache_*.db)

-Restarting explorer.exe and full system reboots

-Copying the DLL to System32 and registering from there

-Using both the .bat installer and manual registration

The issue happens on ALL drives (C: and F:), not just the external one, but I suspect it might be related to the fact that the SAI 2 installation is on a non-system drive. Been trying to fix this for hours and nothing seems to work

Wunkolo16 days ago(+1)

Hey! Sorry for the trouble.

Just making sure, what version of Sai2 are some of these files made on? It looks like there were some recent updates to Sai2 that might have changed how the file format works a bit, which I am still looking into at the moment and wanna be precise about what version you might be on. Do you see thumbnails for an Sai1 files you happen to have? Otherwise, are you installing the correct 64-bit version of SaiThumbs Particularly the one from the SaiThumbs-x64.zip file? Be sure to uninstall the previous version if you end up switching to the correct version to make sure there is no additional complexity. Generally the location of your Sai installation should not matter much, I personally have Sai2 installed on a separate drive as well, so that shouldn't impact the thumbnail generation. Though, it might matter what drive the SaiThumbs installation is on, and it will likely need to be located on a stable system-folder of some kind and not on an external drive.

Lumin0usOrbit16 days ago

It's alright, that one's on me—I forgot to mention I recently updated to the latest SAI 2 build (2026.07.04), which no longer supports exporting to the legacy .sai format. It does seem the update changed a few things here and there, nothing to do with your work.. Since regsvr32 completes successfully and returns DllRegisterServer succeeded, the issue likely isn't with the DLL itself or its registration, but rather with how the new file format is being written or interpreted by the thumbnail handler

Wunkolo14 days ago

It's likely that my Sai2 code was not considering an edge-case in the file format that the latest version of Sai2 utilizes that I'll have to reverse-engineer. I notice some people on the GitHub page are running into similar issues, though with larger documents. Do your issues seem similar?
https://github.com/Wunkolo/SaiThumbs/issues/12

Either way, this may take a bit of time to reverse engineer!

Wunkolo5 days ago (1 edit)

So the file type has actually stayed largely the same and shouldn't be effected by the new version. I've tested both Alpha.2026.09.02 and the 2026.07.04 build. I did fix this bug and updated the latest build to address that but it probably doesn't address the bug you're describing in particular. Are you still seeing this issue on the new version? Have you tried any other attempts to resolve it?

itch.io

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