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I could possibly find freeware to do this task, but I wouldn't in general trust freeware for business purposes. 
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UPX Unpacker: Additional Functionality
Open UPX-compressed files seamlessly in Resource Tuner, without long workarounds.
Resource Tuner ships with the static UPX Unpacker plug-in. This is a start-up processing plug-in for unpacking files compressed with UPX. This unpacking feature supports all versions of UPX, ranging from the early obsolete versions (prior to 0.80) to the latest 4.0x versions.
Now you can open files compressed with UPX even without knowing that!
When you open a file with Resource Tuner, the integrated UPX Unpacker plug-in detects whether the file is packed with UPX. If the file is packed, Resource Tuner proceeds to unpack it automatically.
The resulted file will also be saved unpacked. Resource Tuner does not re-pack the previously packed files back to the exact original size. That is why the original file size may be increased after you open and save the executable WITHOUT making ANY changes to it in Resource Tuner.
The UPX Unpacker displays lines of messages at the bottom log window as follows:
Resource Tuner's UPX Unpacker plug-in specializes in unpacking files compressed with UPX. It effectively handles UPX-packed malware executables, even if the UPXed file has been manually modified to prevent direct unpacking with UPX.
Additionally, the UPX Unpacker is designed to support decompressing files that have been packed by various UPX scramblers, such as Advanced UPX Scrambler, UPoLyX, UPX Lock, UPX Mutanter, and others. This functionality enables Resource Tuner to unpack files that have been made deliberately challenging to extract using standard UPX methods.
Plug-in Manager
The Plug-in Manager displays a list of all available plug-ins. When accessed, it allows you to set priorities for individual plug-ins. Larger priority values indicate higher precedence, while assigning a priority of zero disables the plug-in, which is indicated by the plug-in being marked in red. By adjusting the priorities of the plug-ins, you can control their execution order and enable or disable specific plug-ins as needed.
Download Resource Tuner and consult the help for the plug-in API: you can write your own custom start-up processing plug-in for crypted files handling and unpacking the packed files.
Start Tuning Your Applications Now!
Give Resource Tuner a trial run for 30 days free! Once you try it, we think you will find it hard to go back to other resource hacking utilities. For maximum editing and inspecting power, purchase a Personal license now for $49.95. The Business license is available for $89.95.