R devel - Feb 2023 - long path names (more than 260 chars) not working under Windows OS, longPathAware missing in exe manifests?

Can you help please?

All file und dir funktions and also basename() do not work in R under Windows OS
if the path is longer than?260?characters.
The problem seems to be, that the manifest for all R executables do not have the
longPathAware switch in the manifest.
(The registry and or the group policy for the long path name support are
enabled)

This is the correct extension for the manifest of the executables.
<ws2:longPathAware>true</ws2:longPathAware>

Is it possible to add this into all manifests for windows executables?
Or is ther an other opportunity?

Snippet from Microsoft:

<application xmlns="urn:schemas-microsoft-com:asm.v3">
<windowsSettings
xmlns:ws2="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
<ws2:longPathAware>true</ws2:longPathAware>
</windowsSettings>
</application>

Roman

On 2/14/23 12:11, Roman Hille wrote:
> Can you help please?
>
> All file und dir funktions and also basename() do not work in R under
Windows OS
> if the path is longer than?260?characters.
> The problem seems to be, that the manifest for all R executables do not
have the longPathAware switch in the manifest.
> (The registry and or the group policy for the long path name support are
enabled)
>
> This is the correct extension for the manifest of the executables.
> <ws2:longPathAware>true</ws2:longPathAware>
>
> Is it possible to add this into all manifests for windows executables?
> Or is ther an other opportunity?
>
> Snippet from Microsoft:
>
> <application xmlns="urn:schemas-microsoft-com:asm.v3">
> <windowsSettings
xmlns:ws2="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
> <ws2:longPathAware>true</ws2:longPathAware>
> </windowsSettings>
> </application>
Declaring that R is long path aware is indeed easy, however, before we 
can do this, we actually have to make it long path aware, which is a lot 
of work. Incidentally it is work in progress, I've been working on that 
in the last few weeks.

Currently, neither R-devel nor any released version of R is long path 
aware. One possible work-around is to use mapped drives to make the 
paths shorter.

Whenever possible, it is better to make the paths short, anyway, because 
a number of other applications as well as some parts of Windows don't 
support long paths. Very likely this will also be the case of 
contributed packages. Indeed, and consequently, a number of users will 
not enable long paths on their systems.

Best
Tomas
>
> Roman
>
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