Statements at the vendors websites and various postings in the Access newsgroups have indicated the following work in Access. As always your mileage may vary. Try before you buy.
File Compression using the OS and NTFS file system
See Visual Basic > Files Directories Drives - Compress-uncompress an file or directory for sample code. See File Compression and Decompression (Windows) for more details. All you need to do is to set the compression state of the file and the OS will compress the file for you.
Note that I haven't tested this code myself.
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