These file types are associated with apps for various mobile devices (e.g. Blackberry Java apps). Since these are generally undocumented proprietary compiled formats, they will probably be of little use to you unless you want to reverse-engineer the app. If you do, patience, trial and error, and a hex editor will be needed.
In general, for unknown package formats it's useful to try opening in 7-zip. It's possible that the archive contains files in some e-book format you can read.
alx
From here, we see that an alx
file is an XML document containing a description of the app, e.g.
<loader version="1.0">
<application id="com.rim.samples.device.httpdemo">
<name>Sample Network Application</name>
<description>
Retrieves a sample page over HTTP connection.
</description>
<version>1.0</version>
<vendor>Research In Motion</vendor>
<!-- more metadata truncated -->
</application>
</loader>
You can therefore open it in any text editor, e.g. MS Notepad or Notepad++.
cod
A cod
file is apparently a proprietary encoding of a compiled Java class file. This guy has reverse-engineered the format's header. With some effort you could probably extract the Java bytecode, and then disassemble it using javap
. But unless you're interested in reverse-engineering the app, this file probably won't be of any use to you.
prc
I believe this is a Palm Pilot code format. See whether you can find Palm-related computer software that can read it. If it's just an app, it will probably be of little use to you for the same reason as for cod
.
However, it's also been extended into an e-book format, so you could try opening it in an e-book reader like Calibre if you suspect that's what it contains.
sis
As Journeyman Geek pointed out, SIS is an installer package for Nokia/Symbian devices. It might be a renamed ZIP file (try opening it in 7-zip). Since Symbian is partly open-source, you might be able to find better docs for this format.
for sis, use this: http://symbiandev.cdtools.net/
– tumchaaditya – 2012-07-25T08:55:42.980@tumchaaditya "SIS package is not supported." – b a – 2012-07-25T19:06:45.643
A little more info on 'something' would be nice. – Journeyman Geek – 2012-07-27T05:40:53.267