To my knowledge, this will be the pnly (or almost) guide about that particular file type: .tpa.
You may find them on recovery CD/DVDs. You may want to restore the image, but sometimes the automated script will fail (as it happened to me).
Without doing any reverse engineering, that could be illegal, I will explain the needed command lines to restore those TPA files.
First, contrary to what some of you may believe, you don't need Ghost, I mean the whole application. The reason is quite simple: the batch files you may find on the backup CD/DVD only refer to Ghostwin or Ghost32.exe (when creating the image, in a TPA file)... But these Ghost files seem to be absent on the backup CD/DVD you have.
Here is the trick, in fact you don't need them!
Browse the folders around the TPA files, you'll find a "recounpack.exe" one, which is only what you need.
Here is the command line that works:
recounpack.exe %file%.tpa f:
Where %file% is the filename of the fine which extension is ".tpa", and F: the letter of the drive where the whole image will be restored.
Et voilà :)
NB : please be careful as this operation will destroy all data on the destination drive you set up.