void Image Viewer Install association command line

[2late]

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voidImageViewer.exe /<bmp|gif|ico|jpeg|jpg|png|tif|tiff>
voidImageViewer.exe /bmp|gif|ico|jpeg|jpg|png|tif|tiff

this command give me an error: The syntax of the command is incorrect.

[void]

Please specify only one of the options at a time:

For example, to associate gif files with voidImageViewer:
voidImageViewer.exe /gif

For example, to associate gif, jpg and png files with voidImageViewer:
voidImageViewer.exe /gif /jpg /png

[2late]

Thank you for your help
but it seems that Windows does not allow changing file association by the command prompt (win 8.1)

[void]

Some notes:
When running "voidimageviewer.exe /gif", voidImageViewer will attempt to relaunch with administrative privileges.

I've check this on Windows 8.1 x86 / Windows 10 x64 and it appears to work:
When I run "voidimageviewer.exe /gif" I receive a user account control prompt to allow voidimageviewer to make changes to the system.
When I open a gif file I receive another notification at the top right of the screen that new apps that can open this type of file.
If I click on this notification, I can choose to click on voidImageViewer, which will then open my gif file with voidImageViewer.

What are your User Account Control settings (under Action Center)? -Perhaps voidImageViewer is blocked?

Do you receive the UAC prompt when running "voidimageviewer.exe /gif" ?

Does "voidimageviewer.exe /gif" work from a console run as administrator?

[2late]

What are you User Account Control settings (under Action Center)? -Perhaps voidImageViewer is blocked?

UAC is set to default settings. How can voidImageViewer be blocked?

Do you receive the UAC prompt when running "voidimageviewer.exe /gif" ?

yse

Does "voidimageviewer.exe /gif" work from a console run as administrator?

Yes of course

When I open a gif file I receive another notification at the top right of the screen that new apps that can open this type of file.

I don't receive this notification. maybe something wrong with my windows.

however I managed to get this work under Windows Recovery Environment (WinRE) and that is what I care about
I very much appreciate your help and thanks for this wonderful program