Could GPG4WIN use the other encryption tool's keys for encryption?

I want to know whether GPG4WIN tool can use other encryption tool created Public key and private key for encryption and decryption the given file.

If possible please let me know. Thanks

Yes it can. You have to import/add the keys to your keyring. Most public key pairs are text files that can be added. You may not be able to read or make any sense of the file but GPG can. You may have to change the extension of the file name to make it work in some cases.