我想删除文件中的某条记录该如何做呢？(100分)

不好意思， 我不会呀。 我只会用Handle型进行文件操作（如： FileId := FileCreate('aaa.txt')）。
嗯...
不过我可以为我不会pascal型file操作找个理由：
Old style Pascal files: These are the types used with the old file variables,
usually of the format "F: Text: or "F: File". There are three classes of these
files: typed, text, and untyped and a number of Delphi file-handling routines,
such as AssignPrn and writeln, use them.
These file types are obsolete and are incompatible with Windows file handles.

多人接受答案了。