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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 (http://upx.github.io). All versions of UPX are supported, from the obsolete early versions (prior to 0.80) up to the latest versions 3.x.
Now you can open files compressed with UPX even without knowing that!
When you open a file with Resource Tuner, the UPX Unpacker plug-in detects whether the file is packed with UPX, and if so, this file will be unpacked 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.
The UPX Unpacker displays lines of messages at the bottom log window as follows:
Resource Tuner unpacks only files compressed with UPX. The UPX Unpacker plug-in works on packed malware executables and can handle an UPXed file even if it has been modified manually so that UPX cannot be used directly to unpack the file.
The UPX Unpacker also supports decompressing files packed by various UPX scramblers which make UPX-ed files unpackable: Advanced UPX Scrambler, UPoLyX, UPX Lock, UPX Mutanter, and more.
Plug-in Manager
The Plug-in Manager lists all the plug-ins that Resource Tuner has. When this is open, you can set priority for a selected plug-in. Larger values have greater priority, zero disables the plug-in and marks it red.
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.
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. So if you decide to purchase it, it's only $49.95 for a Personal License. A Business license is available for $89.95.