reverse engineering solution

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I wanted to reverse engineer a program to remove dongle authentication for a software just for educational purpose. the software is built on visual basic 5.0 and the source code is lost. Can I decompile it back to .vb file or not. I tried x64dbg and ollydbg but not string reference was found. I used a decompiler after which I got .frm and .frx files. are these useful. Can I get back to source code? It does not use and .net framework. What should I do?

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