Macro to copy from xls( variable filename) to static xls filename

Hello,
I am attempting to copy data from various cells( not contigeous) in an xls file with a variable name to another xls file with a static filename. The cells i wish to copy from are all over the place ie. I10,J12,D12,D10 etc, etc. Although these cells remain constant in each xls file with a variable filename.
I wish to paste these cells in the file ( static filename) in A2,B2,C2 etc,etc .

The next time the xls file ( variable filename) is opened I wish to paste the contents of the same cells I10,J12,D12,D10 to the next available line free in the xls file ( static filename).
any and all help appreciated.

Yes these variable files will be in the same folder as the static named file.
The variable xls filename will be FTP'd in from a firewalled server, its the only way we can get the file out, once out it will populate in the same folder as the static named xls file. the FTP process may be run several times and therefore each iteration of the xls file will have a different filename.eg. IRF1234,IRF1235,IRF1236 etc etc. Also the desifgnation may change to LSPF****,LSPF***2,LSPF***3, etc and finally POF***1,POF***2 etc.

Thanks for your reply