What program you using and what type of file you trying to open?
Some file types you wont be able to open due being crypted i believe
this doesnt sound crystal related. since yourr not using the crystal client or crystal editor
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Do you have both .wil and .wix for the file you're trying to open ?
on the RPG viewer make sure you've selected it to open .wil
new korean files can't be opened with the wil editors afaik - i use the crystal editor to convert them to lib first, then open them.