Yeah, it's not a good comparison. When you previewed those other files, you didn't move or anything their original incomplete, so Limewire knew (through downloads.dat) that, when you clicked Resume, it had to resume the incomlete file (in the Incompletes folder it looks something like this: "T - ######## - <filename>").
By removing the incomplete file of the dld that you are trying to resume now, you probably corrupted downloads.dat and it's backup downloads.bak, which would cause Limewire not recognizing them as a previous Incomplete. It is almost the same as partially dlding a file through another P2P client (even one that connects to Gnutella) and then moving that partially dlded file in LW's Incomplete folder in hopes of resuming it through LW.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

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