Problems with making my own InputStream

[eXpl0it3r]

So 7zip users can right-click (for example) a .uqm file and unpack it? (This is a real file extension, used by The Ur-Quan Masters aka Star Control 2.)

I guess 7zip has options for the context menu, but it will usually show in every context menu for any file (you can make an archive or unpack one).
If you choose to unpack an archive it will try to do so, if the format is not supported it will give you an error.

So yes you can unpack all newer office files (e.g. .docx, .xlsx) - they are just zip files (useful to retrieve all the images of a Word file) - or you can unpack many setup files - not sure what compression they use. So if uqm is a standard archive format or if it's supported by 7zip you can directly unpack it.

So if I know a file contains some other files, first thing I do will be unpacking it.

[Celtic Minstrel]

Ah, okay, that makes sense. Still, I think the point was that compressing the file and stripping all signs that it's a compressed file would do a far better job of obfuscating its contents than XORing the contents with a constant.