This capability is not listed in the "designer" of Package.appxmanifest, you have to add it manually via code.
Go to Solution Explorer and right-click Package.appxmanifest. Select View Code.
In the code view update the Package
element to contain the following:
<Package
...
xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
IgnorableNamespaces="uap mp rescap">
Do not duplicate the IgnorableNamespaces
attribute, just append rescap
to the end of its value. Now scroll down below and find <Capabilities>
. Inside add the broadFileSystemAccess
capability as follows:
<rescap:Capability Name="broadFileSystemAccess" />
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