[dotnet-sdk-9.0.100] DefineStaticWebAssetEndpoints on build throws FileNotFoundException: "Could not find file 'wwwroot\arrivalsÞpartures.jpg'" ( % character in file name )

[atziasios]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I have .net 8 solution including a blazorApp project with some images in wwwroot and I upgraded it to .net 9. When trying to build it I got the error:

"The "DefineStaticWebAssetEndpoints" task failed unexpectedly.
System.IO.FileNotFoundException: Could not find file 'wwwroot\arrivalsÞpartures.jpg'.

The actual file name is: "arrivals%Departures.jpg".

In general I saw this failing with other file names, too, containing the % character, after upgrading to .net 9.

OS: Windows 11 23H2
CPU: X64
.NET Build Number: dotnet-sdk-9.0.100 with VS 17.12.2

Expected Behavior

Build successfully.

Steps To Reproduce

Steps:

• Create a .NET 9 Blazor WebAssembly project.
• Add a file arrivals%Departures.jpg under wwwroot folder.
• Build.

Attaching demo: BlazorApp1.zip

Exceptions (if any)

Build failed with this error:

The "DefineStaticWebAssetEndpoints" task failed unexpectedly.
System.IO.FileNotFoundException: Could not find file 'wwwroot\arrivalsÞpartures.jpg'.
File name: 'wwwroot\arrivalsÞpartures.jpg'
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileInfo.get_Length()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.GetFileLength(StaticWebAsset asset)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.CreateEndpoints(StaticWebAsset asset, ContentTypeProvider contentTypeMappings)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext()

.NET Version

9.0.100

Anything else?

No response

[javiercn]

@atziasios thanks for contacting us.

This seems to be a dupe of #58975

[javiercn]

We'll use the other issue to track it