Support Can't see files in Windows Explorer, unless I rename them

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http://androidforums.com – I connected my ASUS TF300 to my Windows 7 desktop to try moving some files. The "Internal Storage" drive is displayed in Explorer. (I don't have an SD card) I could see the various folders. However, when I browse to one of the folders using Win Explorer, I only saw 2 files. If I look at that same folder on the tablet, there are about a dozen files. As a test, I renamed one of the "missing" files (a PDF) on the tablet using the file manager and then it showed up in Windows. I renamed another, and then it showed up too. The files in question I retrieve from my Microsof (General)