.evt
a file viewer is when u open ur files
application log, security log, system log
.PTX is the extension for files created by E-Transcript. You can download the viewer of these files at http:/www.reallegal.com/softwareDownloadETranscriptViewer.aspIt is also used by Pentax cameras, but the most unusual and difficult to find is the one I gave.
An image file. It is a Microsoft bitmap file. You can open it in almost any image editor or viewer
TBN files are a type of a JPG file extension. Therefore, in order to open TBN image files on Windows XP, you can use any standard image editor or viewer.
An AutoCAD viewer is a program used for viewing and editing AutoCAD drawing files. Typically you can create JPG files from your drawings and print them using an AutoCAD viewer.
The extension of files to be opened by Adobe Acrobat is pdf.
There is list of programs that support DO file extension http://www.howopen.org/en/extensions/web-files/do
sai
To open ITHMB files, which are typically used by Apple's iPhone and iPad for storing photos, you can use various methods. One option is to rename the file extension from .ithmb to .jpg and then try opening it with an image viewer. Alternatively, you can use third-party software like ITHMB Converter or a dedicated file viewer that supports this format. If you're on a Mac, you can also use the Preview app to open these files directly.
.XLS files are standard Microsoft Excel spreadsheet files. .XLT extension is used for the Excel template files. - Neeraj Sharma
You can view pdf files on it, as well as word and other files apparently.