MemcardRex v1.4 is released. MemcardRex is an advanced PSX memory card editor which supports a variety of formats. It also enables you to edit saves by changing the prod code, identifier and region. With a built in icon editor you can also edit or extract icons of the saves.

MemcardRex v1.4 Changelog:
C# class which incorporates the interface can be downloaded below.

In order to run MemcardRex .NET Framework 2.0 is required.

Download: MemcardRex v1.4
Source:Here