Recently I came across a new type of file format which is “ex_” instead of “exe“. First I tried executing it by simply renaming it from “filename.ex_” to “filename.exe” but it did not work that way. “ex_” is actually compressed form of “exe” files and they need to be expanded. The most suitable way is to use command line. Follow the given steps:

• Open the command prompt by going to “Start->All Programs->Accessories->Run” and then type “cmd” in Run window. Run can also be opened by pressing “Windows button + r“
• In the command prompt go to the folder where your file “filename.ex_” is stored. For ease I would suggest you to manually copy the file into C drive. Make a new folder named say “new“
• If you are in different directory than C then type “cd ..” and press enter. Do it a couple of time until you are :C directory.
• Now use the command: expand filename.ex_ c:newfilename.exe
• This command may result in following error: EXPAND.EXE Error Msg: Can’t Open Output File
• The reason is very simple. You might not have write permission for the “filename.ex_” or for the folder “new” or for both
• Right click on the file/folder and select properties. If the “Read Only” box is checked, de-select it.
• Now run the previous command again. Use the expanded file in .exe format wherever you want.

Questions and Suggestions are welcomed. Enjoy

Sources: Microsoft