Anything from being a glitch in the program, to corrupt/deleted/missing media, not saving properly or a need for Automatic updating of the WMM software can prevent you from opening an existing project.
And that goes for all versions of WMM.
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∙ 14y ago
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Q: Why might you not be able to open an exisitng Windows Movie Maker Project in Windows Movie Maker version 2.1.4026?