I made successful Silverlight apps with disk access, see here. I also made a UWP app. I tried to add broad file access without success.

<Capabilities>
    <Capability Name="broadFileSystemAccess" />
</Capabilities>

Severity Code Description Project File Line Skip Status
Error Validation error. error C00CE014:
  App manifest validation error: The app manifest must be valid as per schema: Line 35, Column 6, Reason: The element
  '{}Capability' is unexpected with respect to the content model of the parent element
  '{}Capabilities'.
  Expected: {}DeviceCapability. 2017uwp_run_allow C:UserspiotrDownloads2017uwp_run_allow (1)2017uwp_run_allow2017uwp_run_allowbinARMDebugAppxManifest.xml

So I changed to

<Capabilities>
    <DeviceCapability Name="broadFileSystemAccess" />
</Capabilities>

Severity Code Description Project File Line Skip Status Error DEP0700: Application registration failed.
  [0x80073CF6] Package could not be registered. (Exception from HRESULT: 0x80073CF6) 2017uwp_run_allow

Can only Microsoft register or sign applications with broad file access after looking into source code of app?

I added broadFileSystemAccess capability to manifest but it fails to run. Please see here Error is

Severity Code Description Project File Line Skip Status
Error Validation error. error C00CE014: App manifest validation error: The app manifest must be valid as per schema: Line 35, Column 6, 
Reason: The element '{}Capability' is unexpected with respect to the content model of the parent element 
'{}Capabilities'. Expected: {}DeviceCapability. 
2017uwp_run_allow C:UserspiotrDownloads2017uwp_run_allow (1)2017uwp_run_allow2017uwp_run_allowbinARMDebugAppxManifest.xml

I made successful Silverlight apps with disk access, see here. I also made a UWP app. I tried to add broad file access without success.

<Capabilities>
    <Capability Name="broadFileSystemAccess" />
</Capabilities>

Severity Code Description Project File Line Skip Status
Error Validation error. error C00CE014:
  App manifest validation error: The app manifest must be valid as per schema: Line 35, Column 6, Reason: The element
  '{http://schemas.microsoft/appx/manifest/foundation/windows10}Capability' is unexpected with respect to the content model of the parent element
  '{http://schemas.microsoft/appx/manifest/foundation/windows10}Capabilities'.
  Expected: {http://schemas.microsoft/appx/manifest/foundation/windows10}DeviceCapability. 2017uwp_run_allow C:UserspiotrDownloads2017uwp_run_allow (1)2017uwp_run_allow2017uwp_run_allowbinARMDebugAppxManifest.xml

So I changed to

<Capabilities>
    <DeviceCapability Name="broadFileSystemAccess" />
</Capabilities>

Severity Code Description Project File Line Skip Status Error DEP0700: Application registration failed.
  [0x80073CF6] Package could not be registered. (Exception from HRESULT: 0x80073CF6) 2017uwp_run_allow

Can only Microsoft register or sign applications with broad file access after looking into source code of app?

I added broadFileSystemAccess capability to manifest but it fails to run. Please see here Error is

Severity Code Description Project File Line Skip Status
Error Validation error. error C00CE014: App manifest validation error: The app manifest must be valid as per schema: Line 35, Column 6, 
Reason: The element '{http://schemas.microsoft/appx/manifest/foundation/windows10/restrictedcapabilities}Capability' is unexpected with respect to the content model of the parent element 
'{http://schemas.microsoft/appx/manifest/foundation/windows10}Capabilities'. Expected: {http://schemas.microsoft/appx/manifest/foundation/windows10}DeviceCapability. 
2017uwp_run_allow C:UserspiotrDownloads2017uwp_run_allow (1)2017uwp_run_allow2017uwp_run_allowbinARMDebugAppxManifest.xml

• silverlight
• uwp

1 Answer 1

Please refer to this document to add the restricted broadFileSystemAccess capability, and the rescap namespace must be added, and is also added to IgnorableNamespaces.

<Package
  ...
  xmlns:rescap="http://schemas.microsoft/appx/manifest/foundation/windows10/restrictedcapabilities"
  IgnorableNamespaces="uap mp rescap">
...
<Capabilities>
    <rescap:Capability Name="broadFileSystemAccess" />
</Capabilities>

After adding the capability, please open the file permissions for your app in Settings >Privacy & security >File system.