A ProScan programming file, for DMA scanners such as your 325P2 has a text file extension ( *.txt), and thus can be attached to a post without the need to 'zip' (compress) it.
In ProScan, select the 'Database' drop-down menu.
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Look at the file name (see highlighted example). That shows you the folder, on your PC, where the programming file is stored, and the name you have given it.
Select the link "Attach Files", in the lower left column of a post you are creating (but not yet posted as a reply).
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This will bring up a window like that seen in Windows File Explorer. You can then click on links on screen to get to the folder where your file is located.
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Select the file you want to attach & then select the "Open" link to add the file to a post. As already noted above, the default file extension for a DMA scanner ProScan programming file is *.txt, which does not need to be compressed (zipped) to add to a post.
(Programming files for the Home Patrol (database) scanners, such as the x36HP & SDS series, use a different file extension, *.hpd, or *.hpe if exported from Sentinel. Those must be zipped before they can be attached to a post.)