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我正在创建一个 UWP 应用程序，其中将文件存储在本地文件夹中。一切正常，直到我尝试保存 .doc 文件。

1）我正在保存带有扩展名的文件（例如：filename.mp3、filename.flv、filename.png）。

2) 保存此文件时我没有收到任何异常。

3) 但是当我尝试保存 .doc 或 .docx 文件时，例如“filename.doc”，我收到“UnauthorizedAccessException”异常。

4）这里重要的是，如果我尝试在文件名“filename”而不是“filename.doc”中保存没有扩展名的相同文件，它工作正常，没有引发异常。

5) 仅在使用扩展名 "filename.doc" 保存时出现异常，这也仅适用于 ".doc" 和 ".docx" 文件类型。

这是代码

StorageFolder fileFolder = await HelperFunctions.GetSubFolder(4);
        fileName = fileName + file.FileType;
        StorageFile storageFile = await fileFolder.CreateFileAsync(fileName);
        IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read);

        using (IRandomAccessStream tempStream = await storageFile.OpenAsync(FileAccessMode.ReadWrite))
        {
            await RandomAccessStream.CopyAndCloseAsync(fileStream.GetInputStreamAt(0), tempStream.GetOutputStreamAt(0));
        }

这是 GetSubFolder 方法

     public static async Task<StorageFolder> GetSubFolder(int type)
        {
            StorageFolder mainFolder = ApplicationData.Current.LocalFolder;
            Storage

            Folder subFolder;

        if (type == 0)
        {
            var result = await mainFolder.TryGetItemAsync(Constants.TextNotesFilesFolderName);

            //creating seperate folder for text files if not exist
            if (result == null)
                subFolder = await mainFolder.CreateFolderAsync(Constants.TextNotesFilesFolderName);
            else
                subFolder = await mainFolder.GetFolderAsync(Constants.TextNotesFilesFolderName);

            return subFolder;
        }
        else if (type == 1)
        {
            var result = await mainFolder.TryGetItemAsync(Constants.AudioFilesFolderName);

            //creating seperate folder for audio files if not exist
            if (result == null)
                subFolder = await mainFolder.CreateFolderAsync(Constants.AudioFilesFolderName);
            else
                subFolder = await mainFolder.GetFolderAsync(Constants.AudioFilesFolderName);

            return subFolder;
        }
        else if (type == 2)
        {
            var result = await mainFolder.TryGetItemAsync(Constants.ImageFilesFolderName);

            //creating seperate folder for image files if not exist
            if (result == null)
                subFolder = await mainFolder.CreateFolderAsync(Constants.ImageFilesFolderName);
            else
                subFolder = await mainFolder.GetFolderAsync(Constants.ImageFilesFolderName);

            return subFolder;
        }
        else if (type == 3)
        {
            var result = await mainFolder.TryGetItemAsync(Constants.ChecklistFilesFolderName);

            //creating seperate folder for checklist files if not exist
            if (result == null)
                subFolder = await mainFolder.CreateFolderAsync(Constants.ChecklistFilesFolderName);
            else
                subFolder = await mainFolder.GetFolderAsync(Constants.ChecklistFilesFolderName);

            return subFolder;
        }

        else
        {
            var result = await mainFolder.TryGetItemAsync(Constants.FileCardsFolderName);

            //creating seperate folder for text files if not exist
            if (result == null)
                subFolder = await mainFolder.CreateFolderAsync(Constants.FileCardsFolderName);
            else
                subFolder = await mainFolder.GetFolderAsync(Constants.FileCardsFolderName);

            return subFolder;
        }
    }

谁能帮我解决这个问题。在此先感谢，Noorul。

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