One of the frustrating things about HTC is that I cannot manage my files which have been downloaded. On the marketplace, there are some apps which allow you to do this such as:
If I install a file explorer app, will that void my warranty with HTC or Android?
No, you won't invalidate your warranty.* Keep in mind that Root Explorer requires root, though, and rooting will invalidate your warranty. I personally love Root Explorer, so I recommend the non-root version: Explorer.
* I haven't read your warranty, but I've never heard of a condition that bizarre. This is not legal advice; I am not a lawyer.
No, using a file manager will not invalidate your warranty. Rooting often will though. On my phone, I personally use Astro File Manager.
If you want a solution to manage all your files from the desktop, our company produces a solution called SnapPea. It's an easy way to manage contacts, apps, music, and videos from your Windows desktop.
