bak Files ???

[BuckSkin]

At least on my machine, XnView MP has an annoying habit of randomly producing .bak files.
These .bak files show up as thumbnails right alongside the real image file.
I have no idea what the purpose of a .bak file could be.
This behavior is quite random.

What is the purpose and benefit, if any, of these .bak files ?

Is it possible to prevent their being created ?

Thanks for reading and all help is appreciated.

[xnview]

.bak?

[BuckSkin]

.bak?

I am sorry; it is .bak and not .bac; I corrected it in my initial post.

[xnview]

.bak are created when using lossless operation. You can disable them in settings>General>File operations>Make backup...

[BuckSkin]

.bak are created when using lossless operation. You can disable them in settings>General>File operations>Make backup...

Thank you.

Are there any negative effects to disabling them ?

[BuckSkin]

.bak are created when using lossless operation. You can disable them in settings>General>File operations>Make backup...

I am sorry, but search as I may, I am not seeing anything in Settings that will permit me to change this behavior.
I have version 0.81 x64 (27-Jun-2016)

[xnview]

please update your version

[BuckSkin]

I installed the most recent version.
I went to Settings > General > File Operations and unchecked "Make backup for other lossless operations", in fact, all three "Make Backup" options are unchecked.
I closed and restarted.

After all that, within minutes, it had made several more .bak files.

The only thing I am doing is editing embedded comments and adding iptc/xmp data.

The thumbnails for the bak files look exactly like the jpegs; I am afraid I am going to delete a jpeg while trying to get rid of the bak files.

[xnview]

you use only 'Edit IPTC' dialog, and .bak comes? on which format?

[BuckSkin]

you use only 'Edit IPTC' dialog, and .bak comes? on which format?

Sometimes it happens when using "Edit Comment" and sometimes with "Edit IPTC/XMP"

I only ever do this with jpegs.

Another thing it does very often is to "lose" one or more files that are definitely in a folder; I know for absolute fact that the jpegs are there, but for whatever reason, XnView is not displaying them; I can temporarily open a different folder and then go back to the folder I want and the missing thumbnails will reappear.

Machine is 64-bit Windows 7 Pro.

[xnview]

you use only 'Edit IPTC' dialog, and .bak comes? on which format?

Sometimes it happens when using "Edit Comment" and sometimes with "Edit IPTC/XMP"

I only ever do this with jpegs.

Sometimes, not always??

Another thing it does very often is to "lose" one or more files that are definitely in a folder; I know for absolute fact that the jpegs are there, but for whatever reason, XnView is not displaying them; I can temporarily open a different folder and then go back to the folder I want and the missing thumbnails will reappear.

when you enter in a folder?

[BuckSkin]

you use only 'Edit IPTC' dialog, and .bak comes? on which format?

Sometimes it happens when using "Edit Comment" and sometimes with "Edit IPTC/XMP"

I only ever do this with jpegs.

Sometimes, not always??

The creation of the .bak files is sometimes and very random.