Ucak. Cabinet files are simply compressed files. They look exactly like zipfiles & can be extracted in the usual way with WinZip or similar utility. The later gauges introduced with FS2002 are known as XML gauges. These are in CAB format & 3rd party examples should be pasted direct into the FS2002\GAUGES folder. Do NOT extract them into the folder or they will not work. You might like to read my Working with Windows article.
http://www.simviation.com/lair/windows.htmIf you have not already done so try setting your Folder Options as described. This will make it easier to distinguish between Zipfiles & those in CAB format.
You can also check the format of any file by right-clicking its icon & selecting Properties.
PS. I'm not familiar with this particular panel. It's possible the gauges are in the conventional GAU format. In this case take my tip & extract those zipfiles to a Temp folder. Then find the GAU files, select them all & paste them into FS2002\GAUGES. Do NOT overwrite existing files if prompted. Please ignore all instructions to extract zipfiles direct to the sim. This is the most common cause of all installation problems.
PPS. I think this covers your particular problem.
http://www.flightsimonline.com/ac520/