I'm guessing you mean cannot because it will cause a program to crash as opposed to cannot because the file is locked by the system?

>A .FLL cannot be deleted as long as it's in use by SET LIBRARY.
>
>>When you issue a command like:
>>

>>set library to vfpencryption.fll additive
>>

>>Does the .fll get completely loaded into memory at that point? In other words, could the actual .fll be deleted at that point and the function calls still work?
>>