下载的deb包安装问题

[eahill]

从网上下的游戏包，sudo dpkg -i * 好多都装不上，出现如下错误

The filename "libsdl-pango1_0.1.2-1_i386.deb" indicates that this file is of type "Software package". The contents of the file indicate that the file is of type "plain text document". If you open this file, the file might present a security risk to your system.

Do not open the file unless you created the file yourself, or received the file from a trusted source. To open the file, rename the file to the correct extension for "plain text document", then open the file normally. Alternatively, use the Open With menu to choose a specific application for the file.

本来就是软件包，点一下就变文本了，不知为什么阿？怎么才能正确安装呢？